Recent content by dasblack

I see what you meant by the total resistance. Shouldn't each wire have a resistance of 1 ohm and not 0.5? From part a 2 ohms for the wires and 30 for the bulb

So for a.) I = 6/32 => 0.19 Amps b.)V = 0.19 x 32 => 6 volts ?

Homework Statement Assume the wire resistance is 1.0 Ohms, the power supply is an ideal 6V voltage source, and the light bulb resistance is 30 Ohms. In the circuit below: a). A lightbulb is connected to the power supply using two such wires. Calculate the current (in A) in the circuit. b)...

Hmm.. I did that and got 6.746. It says I am within 10% of the correct value

Homework Statement A metal wire has a resistance of 8.10 at a temperature of 20°C. If the same wire has a resistance of 11.45 at 90°C, what is the resistance of the wire when its temperature is -20°C? Homework Equations R=R(o)[1+alpha(T-To)] alpha=R-Ro/Ro(T-To) The Attempt at a...

Homework Statement You would like to check if the battery voltage drops while it is supplying a current of 6A. You use a voltmeter designed to measure voltages up to 20V and having a resistance of 50,000 Ohms. Which of the two circuits below should be used? a.) How much current (in A) would...

Homework Statement The manufacturer of a 12V car headlight specifies it will draw a current of 6A. You would like to check this claim with an ammeter designed to measure currents up to 10A and having a resistance of 0.1 Ohms. Which of the two figures below represents a circuit where the...

Hmm I'm not sure about the negative for qo

Homework Statement The figure below shows a test charge q between the two positive charges. Find the force (in Newtons) on the test charge for q = -4 µC. a)Give a positive answer if the force is to the right and a negative answer if the force is to the left. b.)For the previous question...

Yes, 24.4 is the answer, thank you for the help.

Homework Statement The weight of a 1.0 kg object of charge Q is just balanced by another object of equal but opposite charge fixed to a support 74 cm above it. What is the magnitude of the charge Q (in μC)?Homework Equations F=ke|q1||q2| / r^2 F=maThe Attempt at a Solution F=(1kg)(9.8m/s^2) =...