Question 27
Current ElectricityAn electric cell has an internal resistance of 2 ohms. A current of 0.5 A is found to flow when a resistor of 5 ohms resistance is connected across it. What is the electromotive force of the cell?
- A.5 volts
- B.3.5 volts
- C.2.5 volts
- D.1 volt
- E.10 volts
Show the answer and explanation
Answer: B (3.5 volts)
Explanation
E = I(R + r) = 0.5 × (5 + 2) = 3.5 V.