brettb926 brettb926

05-08-2020
Physics

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A motor operating on 245 V electricity has a 172 V back emf at operating speed and draws an 11.6 A current. (a) What is its resistance (in Ω)? Ω (b) What current (in A) does it draw when it is first started? A †

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chezzah chezzah

05-08-2020

Answer:

a) 6.64 Ω

b) Yes

Explanation:

a) resistance = potential difference / current

means R = V / I

R = ( 249V-172V ) / 11.6

R = 6.63793......

R = 6.64 Ω ( 3 significant figures )

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