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- Ch. 18-20 Practice Problems

Ryan W.

What is the equivalent resistance and current for a series circuit with a 12V battery and a 6.75-ohm, 15.3-ohm and 21.6-ohm resistor?

Req=43.6 ohms

I=0.275 A

What is the equivalent resistance and current for a 18-ohm, 9-ohm and 6-ohm connected in parallel with a 36V source?

Req=2.99-ohms

I=2A, 4A, 6A

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What is the equivalent resistance of a 12-ohm and 4 ohm parallel circuit connected in a series with two 4-ohm resistors in parallel and a 2 ohm resistor in series?

Req=7-ohms

An electric heater is operated by applying a potential difference of 50V across a wire with a resistance of 8-ohms. What is the current and power of the heater?

I=6.25A

P=312W

If you double the current in a circuit, how much does the power change by?

By a factor of 4

Which wire has the most resistance?

- A long, fat wire

- A short fat wire

- A long skinny wire

- A short skinny wire

The long skinny wire

True or false: Electrons travel through a wire in a straight line.

False. Electrons take a zigzag path.

What is the current if 4 electrons pass through a wire in 24 seconds? What is the total charge that passed through the wire in 5s?

I=0.167 A

Q=1.33x10^-19 C

A proton is placed in a uniform electric field toward the positive plate. Does it gain or lose electric potential energy?

Gain

A proton moves 1.5cm in an electric field with a strength of 1.7x10^6 N/C. What is the electric potential difference?

V=-Ed (convert to m)

V=2.6x10^4 V

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