Question

The heater has a resistance of 3ohm The voltage source has an emf of 12v and an internal resistance of 1ohm at what rate does the voltage source apply energy to heater

Answer 1

Answer:

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Answer 2

Energy is supplied to heater at the rate of - 27 W

Energy supplied to heater is equivalent to the power dissipated by heater.

Thus, power dissipated by the heater will be calculated by the formula -

P = I²R.

Current will be calculated by the formula -

V = IR

Here, p denotes power, I denotes current, r represents resistance, and V denotes voltage.

Total resistance of heater will be sum of external resistance and internal resistance.

Thus, R' = 3+1 ohm

R' = 4 ohm.

Now, calculating current -

(Total resistance will be considered here)

I = V/R

I = 12/4

I = 3 ampere.

Hence, power dissipated will be -

(Resistance of heater will be considered here)

P = 3²*3

P = 27 Watt