Question

An electric device draws 7.10 A at 240 V. If the voltage drops by 35 %, what will be the current, assuming nothing else changes? Express your answer to two significant figures and include the appropriate units. ЦА ? I final = 2.7 A Submit Previous Answers Request Answer X Incorrect; Try Again; 7 attempts remaining Part B If the resistance of the device were reduced by 35 %, what current would be drawn at 240 V? Express your answer to two significant figures and include the appropriate units. μΑ ? I final = Value Units

Answer 1

V = IR

=> R = V/I = 240V/7.10A = 33.8 ohms

Part A: V_{​​​​​new} = V × (1-0.35) = 0.65 × V = 0.65 × 240 V = 156 V

R = 33.8 ohms

Current (I_{​​​​​​new}) = V_{​​​​​new}/R = 156 V / 33.8 ohms = 4.615 A

Part B: R_{​​​​​​new} = (1-0.35) × 33.8 = 21.97 ohms

V = 240 V

I_{​​​​​​new} = V/R_{​​​​​​new} = 240 V / 21.97 ohms = 10.92 A

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