An electric wire is connected across a cell of e.m.f. E. The current 1A is measured by an ammeter of resistance R. According to ohm's law:
Correct answer: B. E=IR
- A. E=I2R
- B. E=IR
- C. E=R/I
- D. E=I/R
Explanation
The emf is given by relation E=IR.Ohm's law states that the current through a conductor between two points is directly proportional to the voltage across the two points.
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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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