Ammeter Definition and 90 Threads

Let's say the elements connected in parallel have voltage drop of ##V_x'## each , hence they should have the same resistance ##R_x'##as per the conditions of the problem (since it mentions that if voltage drop across an element is less than ##1## or greater than ##1## , it has some constant...

Hello guys. I'm having some trouble to understand the real difference from the Galvanometer and the Ammeter. The best comment I saw in some forum was: Ammeter: ANY instrument used to measure electrical current Voltimeter: ANY instrument used to measure voltage difference Galvanometer: a...

Question: My attempt: Does 4.75 amps for the full scale deflection seem okay? Thanks for any help!

Please can someone tell me how to solve the below: we have been given: can someone please explain how we deal with two theatas? please ignore full stops wouldn't line up any other way!

I am a student at a trade school, majoring in HVAC. My electricity for HVAC textbook has a chapter on electric meters. However, my textbook does a poor job of explaining how a digital ammeter works. My textbook has the following description of how digital ammeters work: "To make meters...

Homework Statement [/B] Hello, basically I have some tasks about calculating the reading of voltmeter and ammeter in a circuit, I can solve these with simpler circuits, where voltmeter is reading a few elements, but as in the ones below, I'm not sure where to begin and what to add into the...

So I'm fairly new to electronics. I took physics 2 in college and thought I'd give the hobby a try. I started with a very basic circuit. Just a power supply connected to a light-bulb. However, as simple as it was, I had several questions when taking the reading of my circuit with a multi-meter...

Homework Statement [/B] It is required to find the current through the ammeter, marked A, in the above figure.Homework Equations ##V=iR##The Attempt at a Solution I've redrawn the circuit as follows - But don't know how to obtain the value ##i_3##

Homework Statement Homework EquationsThe Attempt at a Solution I am not able to understand how percentage error in R is calculated using the given circuits. Should I assign currents in the branches and write KVL equations ?

Homework Statement Hi! A battery of emf 12 V and negligible internal resistance is connected to a resistor of constant resistance 6 Ω, an ideal ammeter and an ideal voltmeter. The voltmeter and ammeter are in series with the cell and the resistor. What is the reading on each? Homework...

In my physics textbook it says that ammeter in circuit C shows higher current than ammeter in circuit A and D. And the voltmeter shows higher voltage in D than in B, and C. It's explained in the book that way: some electric current is passing through the voltmeter in C, thus the ammeter will...

Recently I asked why with a multimeter you should not measure the resistance of a fuse in a car while there was still power reaching the fuse but why it was ok to measure the voltage. I was told the way resistance is measured is a small current is sent by the meter for the calculation to be...

I need to measure current in DC system. I have circuit breaker (125A), so 150A shunt is selected. On that shunt ammeter is connected. But that ammeter has 60mV, scale 0-150A. What does this 60mV means on ammeter? Is it correct?

Homework Statement Homework EquationsThe Attempt at a Solution Part a) Voltmeter can be replaced by an open circuit and ammeter can be replaced by a short circuit .By doing so the current flows in the outer loop consisting of both the batteries and both the resisters .The current in the...

Homework Statement In this circuit What will be the reading of the ammeter and that of the voltmeter when: 1. Key S1 and key S2 are open. 2. Key S1 and key S2 are closed. 3. Key S1 is closed and key S2 is open. (Neglect the internal resistance of the source) Homework EquationsThe Attempt at a...

Homework Statement An inductor is connected in series with an AC source, the rms output voltage of it is 260V and a hot-wire ammeter reads 2A. If the ratio of the voltage across the ammeter to the voltage across the inductor is 5/12, determine the resistance of the ammeter. (Neglect the...

Homework Statement We have an ammeter with 20Ω resistance and a range of 10mA or 0.01A. The different ranges are 3000mA, 300mA, 30mA. Calculate the shunt resistors a, b and c. Homework Equations The Attempt at a Solution Ia = 0.01A ; Ra = 20Ω ; I = 0.03A Ua = Ia ⋅ Ra = 0.01A ⋅ 20Ω =...

Homework Statement [/B] An ammeter has a range of 10mA or 0.01A and a resistor of 20Ω. Three shunts are used: R1 = 4Ω ; R2 = 2Ω ; R3 = 4Ω What will the different ranges be (m3, m2, m1)? The Attempt at a Solution [/B] I started by calculating the voltage: Ua = Ia ⋅ Ra Ua = 0.01A ⋅ 20Ω =...

In my textbook it says:"in the hot-wire ammeter the pointer stands at a definite reading when the temperature of platinum-iridium becomes constant and the wire stops expanding. That is achieved when the rate of heat radiated by the platinum-iridium wire becomes equal to the rate of heat...

Homework Statement When I connect just the multimeter (as shown in the diagram) to the power source by inserting the lead into the mA connection and change the setting to read the current on the multimeter, it reads 0. When I change the lead connection from mA to A, the power source circuit...

3. The Attempt at a Solution As temp decreases, the resistance of the thermistor increases...doesn't this mean that the voltmeter will increase too since V=IR? I know that the total resistance of the circuit has increased so less current, but I put down option D but the correct answer is A?

Homework Statement What will the pointer of electrodynamic ammeter show (its natural frequency of oscillation is 5 Hz), if its input is energized by current: a) i (t) = 1.5 + 4 sin (3146 t) b) i (t) = 1.5 + 4 sin (2 t) Ammeter has a range of 6 A and the scale has 100 divisions. Homework...

Homework Statement For the values shown in the figure below, calculate (a) the current through the ammeter A1, (b) the current through the ammeter A2, (c) the PD across R2. Assume that the internal resistance of each cell and the resistance of each ammeter is negligible. Answers: (a) 0.05...

Homework Statement A circuit is setup with an ideal ammeter connected across the 4.0 ohm. What will the reading of the ammeter be? 2. The attempt at a solution I am not sure whether the question is testing my understanding on how an ammeter should be connected in a circuit or about how to...

Which one contributes more error when performing a lab calculating the voltage and current through different ohms of resistance? One was in parallel, the others in series and the last one both in series and parallel. They are systematic errors, but not sure which one would contribute more error...

How come when an ammeter is placed in parallel with a resistor that is connected to a battery, the circuit is considered incorrect + "safe," whereas an ammeter connected in parallel with the whole battery is considered incorrect + dangerous? My guess is that it has something to do with the...

http://www.ebay.com/itm/291369928250?_trksid=p2057872.m2749.l2649&ssPageName=STRK%3AMEBIDX%3AIT i bought this cheap ammeter/voltmeter off ebay. now, i bought 1 before but it was slightly different. the wires had blue red and black instead of blue yellow and green. this makes it confusing but...

Homework Statement Homework Equations 1/R= 1/R1 + 1/R2 +... I1= R2/R1 x I The Attempt at a Solution I chose B because I thought that since total resistance in the branch of variable resistor has increased, the branch with ammeter will get a greater share of current. Since I'm not too sure...

Why is the reading on my D.C. ammeter fluctuating? As in the needle won't maintain at one spot, it'll sway left and right. Also, how do i ensure that the fluctuations are minimized?

Homework Statement The ammeter reads 5.0A. Find I1, I2, and ε Homework Equations ΔV=IR The Attempt at a Solution I've never dealt with ammeters before so I'm very confused. To start, I tried breaking this into loops, and then used Kirchhoff's Law. I started with the left side, since I...

I set an ohm meter to record current in mA, smallest 0.01mA, I took three readings for several different resistances.. What would the uncertainty be? And the same for the voltmeter but reading in volts, smallest 0.01V

Homework Statement In the circuit shown, a student mistakenly connects a perfect ammeter(i.e. One of negligible resistance), in parallel with one of two identical resistors. The ammeter reads 0.40A. What would the reading have been if he had correctly connected the ammeter in series with the...

In a series LC resonant circuit the capacitor acts to cancel out the inductance of the the circuit. With no inductance in the circuit the magnetic field will collapse. So my question is, with this collapse of the magnetic field will it be be harder to measure the current in the circuit with a...

Hi, I want to use a digital ammeter to measure the current flow though a Raspberry pi. The Pi uses about 700mA and is 5V so its got a resiatance of about 7 ohms. Therefore something like 0.5 ohm ammeter will have a large voltage drop of about 0.3V which is way too large and would lead to the...

I am trying to convert galvanometer into an ammeter. But after finding Galvanometer resistance and shunt values, and cut a wire according to that thickness and connected. But still, the galavanometer reading is not similar to that of the standard ammeter reading connected in the circuit. Any one...

Is there any issue to connect the Ammeter in the circuit before or after the load. According to me, the current should remain same in circuit and there should be no restriction for Ammeter connection so it can be placed anywhere in the circuit. please explain why as this question asked to me by...

This is not promoting an advert - just look and see! There is a 'clip on' ammeter for sale on eBay and I can't imagine how it works. It claims to work by clipping it round a cable and the scale shows +/- 30A DC. I spent good money on a Hall Effect clamp meter when it looks like I could have...

To make ammeter, Resistance of proper small value is joined in parallel to the coil of galvanometer.This resistance is called a shunt. For smaller resistance value, We can not use the smallest resistance wire that is directly wound on coil of galvanometer so the resistance will become...

I don't understand a few things here. Firstly, here's the question: This is thermoelectric ammeter. Internal resistance can be ignored. 1. Find the mean square value of the circuit. 2. Find the value that is displayed on the ammeter (alternating current). In the textbook, the formula for the...

if thermo couple ammeter full scale deflection is 10 Amp, for 1/5 th scale what is the Reading?

Homework Statement In the figure R1 = 1.29R, the ammeter resistance is zero, and the battery is ideal. What multiple of ε/R gives the current in the ammeter? Homework Equations V=IR, 1/R=1/R_1+1/R_2..(when resistances are parallel) etc The Attempt at a Solution since ammeter doesn't...

Homework Statement how will you convert a galvanometer of resistance 150 ohm giving a full scale deflection for a current of 3 milli ampere to a ammeter of range 0 to 6 ampere?a uniform rsistance wire of length 60cm and 2 ohm is given.find the length of the wire required? Homework...

How will you convert a galvanometer of resistance 12 ohms showing full scale deflection for a current of 3 milli ampere to (i) Ammeter of range o to 6 Ampere (ii) Voltmeter of range 0 to 18V.

Apparently an ideal ammeter has zero resistance. But for a series circuit, why does it matter? The purpose of an ammeter is to give the reading for the amount of current going round a 'loop' of circuit. Having some resistance does not prevent the ammeter from giving a true reading, right? So...

lets say you have a circuit consisting only of a resistor and battery. Is it absolutely necessary to connect an ammeter in series with the resistor to measure current through it, rather than in parallel? Current doesn't want to go through a resistor, so if you connect a much lower resistance...

It may sound so silly question but I am trying for last 2 hours and no result. I have drawn the following schematic in LT Spice and want to add an ammeter in the black rectangle. In component menu, I don't find anything named ammeter. Any clue? Your help is appreciated.

This is kind of a stupid question but...to measure high currents, a galvanometer is connected parallel to a shunt resistance so that most of the current passes through the shunt resistance but only a small amount of current passes through the galvanometer. But wouldn't this defeat the purpose of...

Homework Statement A ammeter and a voltmeter are joined in series to a cell . Their reading are A and V respectively. If a resistance is now joined in parallel with voltmeter, (a) Both A and V will increase (b) Both A and V will decrease (c) A will decrease V will increase (d) A will increase...

The other day I happened to open an ammeter just out of curiosity. What I saw was that across the positive and negative terminals a wire of considerable thickness(almost equal to the thickness of wires we use for household joints) was wound..It just had 4 or 5 turns. I guess it should be the...

Homework Statement An ammeter whose internal resistance is 63 ohm reads 5.25 mA when connected in a circuit comtaining a battery and two resistors in series whose values are 750 ohm and 480 ohm. What is the actual current when the ammeter is absent?Homework Equations V = IR Rseries = R1 + R2The...