Question

a potential difference of 250v is applied across a resistance of 500 ohms in an electric iron. calculate current and heat energy.​

Answer 1

Answer:

(i) Calculation of Current. The current can be calculated by using Ohm's law equation:

VI=R

Here, Potential difference, V=250 volts

Current, I=1? (To be calculated)

Resistance, R=500 ohms

Putting these values in the above formula, we get:

250I=500

So, I=250500

=12

= 0.5 ampere

Thus, the current flowing in the electric iron in 0.5A.

(ii) Calculation of Heat Energy. The heat energy in joules can be calculated by using the formula:

H=I2×R×t

Here, Current, I=0.5A

Resistance, R=500Ω

And, Time, t=10s

Putting these values in the above formula, we get:

H=(0.5)2×500×10

= 1250 joules