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AP® Physics 1 & 2

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Moderate

What Resistance?

APPH12-OKD1ZB

The circuit shown below consists of a battery, (${emf}_{battery}=\text{25 Volts}$), of negligible internal resistance and two resistors, (${R}_{1}\text{ and } {R}_{2}=\text{25 Ohms}$).

The resistance of the connecting wires is also negligible. A voltmeter (with infinite resistance) connected to points $b$ and $c$ in the circuit indicates $5.0\text{ Volts}$ (${V}_{meter}={V}_{bc}=5.0\text{ Volts}$).

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What is the resistance of the first resistor (${R}_{1}$)?

A

$20\ \Omega$

B

$100\ \Omega$

C

$130\ \Omega$

D

$150\ \Omega$