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SIZIF [17.4K]
3 years ago
8

A dc motor with its rotor and field coils connected in series has an internal resistance of 3.2 Ω. When running at full load on

a 120-V line, the emf in the rotor is 105 V. Part A What is the current drawn by the motor from the line? Express your answer using two significant figures.
Physics
1 answer:
pochemuha3 years ago
7 0

Answer:

The current drawn by the motor from the line is 4.68 A.

Explanation:

Given that,

Internal resistance of the dc motor, r = 3.2 ohms

Voltage, V = 120 V

Emf in the motor, \epsilon=105\ V

We need to find the current drawn by the motor from the line. A dc motor with its rotor and field coils connected in series, applying loop rule we get :

V=\epsilon+Ir

I is current drawn by the motor

I=\dfrac{V-\epsilon}{r}\\\\I=\dfrac{120-105}{3.2}\\\\I=4.68\ A

So, the current drawn by the motor from the line is 4.68 A. Hence, this is the required solution.

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