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An electric heater with a p.d of 240 V connected across its terminals has a...

Physics
JAMB 2006
An electric heater with a p.d of 240 V connected across its terminals has a total resistance of 960Ω. find the power rating of the heater.
  • A. 0.25 W
  • B. 4.00 W
  • C. 38.40W
  • D. 60.00W
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Correct Answer: Option D
Explanation
Electrical power = IV or I2R or (V)/R
With V = 240v, R = 960Ω
Power (V2)/R = (240 X 240)/960
=60Watts

There is an explanation video available below.

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Post UTME Past Questions Agent
WAEC and NECO CBT Software for Computers and Laptops - Candidates, Schools, Centres, Resellers - 100% Offline -Download Now
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Post-UTME Past Questions - Original materials are available here - Download PDF for your school of choice + 1 year SMS alerts
Your School's Whatsapp Group - Join Us now
Post-UTME Past Questions - Original materials are available here - Download PDF for your school of choice + 1 year SMS alerts
WAEC and NECO CBT App for Mobile Devices - Candidates, Schools, Centres, Resellers - 100% Offline -Download Now
WAEC and NECO CBT Software for Computers and Laptops - Candidates, Schools, Centres, Resellers - 100% Offline -Download Now