PPT Slide

2.8 Signal waveforms cont.

Example 2-2

The resistance space heater (of constant resistance RH) when supplied by a 170 sin(120pt) V. (t in seconds) sinusoidal (AC) voltage source takes 5 minutes to raise a room’s temperature 3° F. If the same heater is supplied by a 48 Volt (DC) voltage source, how long will it take (in minutes) to do the same job?

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