The emf of the cell in the following circuit is 9.0 V. The reading on the high resistance voltmeter 7.5 V. What is the current I?
Correct answer: B. 0.5 A
- A. 0.1 A
- B. 0.5 A
- C. 1.5 A
- D. 2.0 A
Explanation
Potential Difference across the 15 ohm resistor is 7.5V,V = IRI = V/R = 7.5/15 = 0.5A
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About Current Electricity
Steady current relates charge flow to potential difference, resistance and resistivity, including how temperature changes a conductor's resistance. Sources with internal resistance have terminal voltage below their emf when delivering current, and maximum power output occurs under a specific load condition rather than at zero resistance.
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