The motor in a toy car is powered by four batteries in series, which produce a t

Question

The motor in a toy car is powered by four batteries in series, which produce a total emf of 6.00V. The motor draws 3.0 A and develops a 4.5V back emf at normal speed. Each battery has a 0.10 ohm internal resistance. What is the resistance of the motor? The motor in a toy car is powered by four batteries in series, which produce a total emf of 6.00V. The motor draws 3.0 A and develops a 4.5V back emf at normal speed. Each battery has a 0.10 ohm internal resistance. What is the resistance of the motor?

Explanation / Answer

here,

as Net current Between motor and battery is

dV = 6-4.5 = 1.5 V

fron ohms law V = iR

Rt = V/i = 1.5/3

Rt = 0. 5 ohms

finally 0.5 = 0.1 * 4 + RM

Rm = 0.1 ohms

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