Circuits

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10 Terms

1
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RL
________ circuits contain just an inductor and a resistor, and perhaps a battery.
2
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RC
When you have both resistors and capacitors in a circuit, the circuit is called an "________ circuit.
3
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L
________ is called the inductance of the inductor.
4
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capacitor
A(n) ________ blocks current once it has been connected for a while.
5
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inductor
A(n) ________ makes use of induced EMF to resist changes in current in a circuit.
6
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ohms
Resistance is measured in ________.
7
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Ammeters
________ measure current, and voltmeters measure voltage.
8
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Current
The flow of electric charge
9
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Resistance
A property of a circuit that resists the flow of current
10
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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 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.