(Solution Download) If the equipment outside the water heater is changed so


If the equipment outside the water heater is changed so that I is 1.2 A and RS is 3.0 ?, how much power will be dissipated in RS?
A. 0.27 W
B. 0.40 W
C. 1.08 W
D. 4.32 W
The diagram shows a small water heater that uses an electric current to supply energy to heat water. A heating element, RL, is immersed in the water and acts as a 1.0-? load resistor. A dc source is mounted on the outside of the water heater and is wired in parallel with a 2.0-? resistor (RS) and the load resistor. When the water is being heated, the current source supplies a steady current (I) of 0.5 A to the circuit. The water heater has a heat capacity of C and holds 1.0 × 10?3 m3 of water. The water has a mass of 1.0 kg. The entire system is thermally isolated and designed to maintain an approximately constant temperature of 60° C.

 







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