An 80 resistance connected to a battery with internal resistance draws 1.6 A, and if a 300 resistance is connected to the same battery it draws 0.5A. What is the current drawn by a 60 resistance from this battery?
Correct answer: A. 2A
- A. 2A
- B. 2.5 A
- C. 2.2 A
- D. None of above
Explanation
Set up two equations using V = E - Ir for the two conditions to solve for the battery's EMF (E) and internal resistance (r). Once E and r are known, use the same formula to find the current (I) when a 6Ω resistor is connected, which correctly calculates to 2A.
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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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