AP Physics LC Circuits

Five wires are made of the same material. Which wire would give the least resistance?

• A

• B

• C

• D

• E

A variable resistor is one that can change resistance, like a dimmer switch. As the resistance increases, which graph best shows the current through the lamp?

• a

• b

• c

• d

Compared to a 3-Ohm resistor, a 6-Ohm resistor has

• 1/4 the power

• 1/2 the power

• 2 times the power

• 4 times the power

Which circuit has the largest power rating?

• a

• b

• c

• d

• e

An electrical circuit is connected to a motor that puts out work for 6 seconds. What is the power of the motor?

• 9600 Watts

• 4800 Watts

• 267 Watts

• 229 Watts

The area under the curve of this graph best represents

• power

• energy

• time

• current

Which two resistors must have the same current? Select two.

• 1-Ohm

• 2-Ohm

• 3-Ohm

• 4-Ohm

• 6-Ohm

Which two resistors must have the same voltage? Select two.

• 12-Ohm

• 6-Ohm

• 4-Ohm

• 3-Ohm

• 1-Ohm

Which is true?

• I₁ + I₂ = I₃

• I₂ + I₃ = I₁

• I₃ + I₁ = I₂

• I₁ = I₂ = I₃

What is the reading on the ammeter in this circuit?

• need to know resistances to determine

• 7 A

• 5 A

• 3 A