Circuits

RL

RL

________ circuits contain just an inductor and a resistor, and perhaps a battery.

RC

When you have both resistors and capacitors in a circuit, the circuit is called an "________ circuit.

L

________ is called the inductance of the inductor.

capacitor

A(n) ________ blocks current once it has been connected for a while.

inductor

A(n) ________ makes use of induced EMF to resist changes in current in a circuit.

ohms

Resistance is measured in ________.

Ammeters

________ measure current, and voltmeters measure voltage.

Current

The flow of electric charge

Resistance

A property of a circuit that resists the flow of current

A 100 Ω, 120 Ω, and 150 Ω resistor are connected to a 9-V battery in the circuit shown above. Which of the three resistors dissipates the most power?

(A) the 100 Ω resistor

(B) the 120 Ω resistor

(C) the 150 Ω resistor

(D) both the 120 Ω and 150 Ω

A - Voltage changes across the 100 Ω resistor, then again across the parallel combination. Because the 100 Ω resistor has a bigger resistance than the parallel combination, the voltage across it is larger as well. Now consider each resistor individually.

By power = V2/R, the 100 Ω resistor has both the biggest voltage and the smallest resistance, giving it the most power.