Question

Which of the following terms does not represent electrical power in a circuit?
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Answer 1

Explanation:

In physics, the rate of electrical energy transfer by an electrical circuit per unit time is determined by electric power. It is denoted by P measured using the SI unit one joule per second or watt.

The formula for electric power

P = VI……………………..(1)

Where

P = Electric power

V = Potential difference in the circuit

I = Electric current.

From ohms law

V = IR……………………….(2)

Substitute equation (2) in (1) we get

P = (IR)I

P = I2R……………………….(3)

From ohm’s law

I = V/R…………………………(4)

Substituting equation (4) in equation (1), we get

P = V2/R..……………………(5)

The equation (1), (3) and (5) represents the electric power, whereas IR2 does not represent the electric power.

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Answer 2

Answer:

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Explanation:

(b) IR²

Because,

(a)P = VI

= IR×I (V=IR)

= I²R

(c) P = VI

(d)P = VI

= V×V/R (I=V/R)

= V²/R

So, (b) I²R not represent power in a circuit