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【单选题】
A student builds a simple circuit with a single resistor of resistance R and current I , and measures an electric potential difference of Δ V 1 across the resistor. Then, the student decreases the current through the circuit to I /2 . How does the electric potential difference across the resistor Δ V 2 t of the new circuit compare with Δ V 1 ?A.
Δ V 2 =4 Δ V 1
B.
4Δ V 2 = Δ V 1
C.
2Δ V 2 = Δ V 1
D.
Δ V 2 =2 Δ V 1
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