In which of the following cases more electrical energy is consumed per hour? 1. A current of 1 ampere passed through a resistance of 300

Q: In which of the following cases more electrical energy is consumed per hour? 1. A current of $1$ ampere passed through a resistance of $300$ ohms. 2. A current of $2$ amperes passed through a resistance of $100$ ohms.

1. $R = 300$ ohm, $I = 1A, t = 1h$ $P = I^2 R = 1^2 \times 300 = 300W$ $E = P \times t = 300 \times 1 = 300Wh$ 2. $R = 100 $ ohm, $I = 2A, t = 1h$ $P = I^2 R = 2^2 \times 100 = 400W$ $E = P \times t = 400 \times 1 = 400Wh$ Hence, in case (ii), the electrical energy consumed per hour is more.

Answer the following questions: [3 M]

MSBSHSE - English Medium

In which of the following cases more electrical energy is consumed per hour?

A current of $1$ ampere passed through a resistance of $300$ ohms.
A current of $2$ amperes passed through a resistance of $100$ ohms.

Download our app for free and get started

Solution

$R = 300$ ohm, $I = 1A, t = 1h$

$P = I^2 R = 1^2 \times 300 = 300W$
$E = P \times t = 300 \times 1 = 300Wh$

$R = 100 $ ohm, $I = 2A, t = 1h$

$P = I^2 R = 2^2 \times 100 = 400W$
$E = P \times t = 400 \times 1 = 400Wh$
Hence, in case (ii), the electrical energy consumed per hour is more.

STD 10
Science
Electricity
Lakhmir

Download our app
and get started for free

Experience the future of education. Simply download our apps or reach out to us for more information. Let's shape the future of learning together!No signup needed.*

Download App

Download our appand get started for free

Similar Questions

Download our app
and get started for free