waec model questions vol1 2019 physics
Objective • Question 17
Question 17
WAEC_MODEL_QUESTIONS_VOL1
•
2019
A battery of emf E volts and internal resistance r ohms is connected to a 6 Ω external resistor. The terminal voltage measured across the external resistor is 12 V. When a second identical 6 Ω resistor is connected in parallel with the first, the terminal voltage rises to 15 V. Determine the emf of the battery (in volts, to one decimal place) and its internal resistance (in ohms, to two decimal places).
Answer Options
A.
E = 20.5 V, r = 1.85 Ω
Correct Answer
B.
E = 19.0 V, r = 2.32 Ω
C.
E = 18.0 V, r = 3.10 Ω
D.
E = 22.0 V, r = 2.00 Ω
Correct Answer
B
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