# Solving Electrical Circuit Puzzle: Voltmeter & Transistor

• rebecca12345
In summary: In this case, a common emitter configuration may be appropriate to amplify the current and provide a stronger voltage for the light. In summary, the poster is seeking help with understanding the properties of amplifiers and which transistor configuration may be appropriate for their problem.
rebecca12345

## Homework Statement

http://web.stagram.com/p/362176186041336029_243276631
this is a link to the question. I'm stuck on 2a and b

## Homework Equations

I don't understand if the voltmeter is reading 6v why the light is not receiving 6v? And why would a transistor help this problem?

## The Attempt at a Solution

a) What properties (there are two candidates here) of a real amplifier cause the output to diminish when loaded?
b) Of the three basic transistor configurations, to wit, common emitter, emitter follower and common-base, which one do you think is appropriate here, and why?

a) if it is an inverting amplifier and operational amplifier?
b) I have never heard of any of them, I'm 16 and doing higher physics in Scotland, we've only ever spoke about transistors and not any types or anything like that

a) has nothing to do with inverting vs. noninverting. Is characteristic of any type of amplifier - op amp, stereo amp, etc.
b) Not transistor types - transistor circuit configurations. You need to look up and study the basic properties of those three configurations and think about which would be suitable in your case.

rebecca12345 said:
1. I don't understand if the voltmeter is reading 6v why the light is not receiving 6v? And why would a transistor help this problem?

When the switch is thrown the voltmeter no longer reads 6V.
Transistors can amplify current and/or voltage depending on circuit configuration.

Last edited:

## 1. What is the purpose of a voltmeter in an electrical circuit?

A voltmeter is a measuring instrument used to measure the potential difference or voltage between two points in an electrical circuit. It helps to determine the voltage level and identify any potential issues with the circuit.

## 2. How does a voltmeter work?

A voltmeter works by measuring the electrical potential difference between two points in a circuit. It is connected in parallel with the component or circuit being measured, and the voltage reading is displayed on a scale.

## 3. What is the role of a transistor in an electrical circuit puzzle?

A transistor is a semiconductor device that acts as an amplifier or a switch in an electrical circuit. In the puzzle, it is used to control the flow of electricity and solve the circuit by either amplifying or blocking the current.

## 4. How do you solve an electrical circuit puzzle using a voltmeter and transistor?

First, you need to identify the components in the circuit and their connections. Then, using the voltmeter, measure the voltage level at different points in the circuit. This will help you determine the direction of current flow and identify any issues. The transistor can then be used to manipulate the flow of current and solve the puzzle.

## 5. What are some common challenges when solving electrical circuit puzzles?

Some common challenges when solving electrical circuit puzzles include identifying the components and their connections, understanding the direction of current flow, and troubleshooting any issues that may arise. It also requires a good understanding of electrical principles and knowledge of circuit analysis techniques.

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