Question

An electric heater operating at 120. volts draws
8.00 amperes of current through its 15.0 ohms of
resistance. The total amount of heat energy
produced by the heater in 60.0 seconds is
(1) 7.20 × 10^3 J (3) 8.64 × 10^4 J
(2) 5.76 × 10^4 J (4) 6.91 × 10^6 J

Answer 1

Ohms law says that V = IR
The amount of work done is P = IV or P = I^2R (using Ohm's law to substitute)
Therefore P = 64*15 = 960W
So the total energy released is Pt = 960*60 = 57600J

Answer 2

Ohm's law :

V = IR

The amount of work done is

P = IV or P = I^2R (using Ohm's law to substitute)

Therefore,

P = 64*15

  = 960W

So the total energy released is

Pt = 960*60

    = 57600J

What is ohm's law ?

"Ohm's law states the relationship between electric current and potential difference. It states that the current that flows through most conductors is directly proportional to the voltage applied to it."

The strength of a direct current is directly proportional to the potential difference and inversely proportional to the resistance of the circuit.

What is work done?

Work done : W = (|F| cosθ) |d|

"Work done is defined as the multiplication of magnitude of displacement d and the component of the force that is in the direction of displacement."

Know more about ohms law here

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