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

Given that:

• A potential difference of 250v is applied across a resistance of 500 Ω in an electric iron.

To Find:

• Current.
• Heat energy produced in joule in 10 seconds.

Formula used:

• I = V/R
• H = I² × R × T

Where,

• H = Heat
• I = Current
• R = Resistance
• T = Time
• V = Potential difference

Finding the current:

ㅤ↠ㅤI = 250/500

ㅤ↠ㅤI = 0.5

Finding the heat energy produced in joule in 10 seconds:

ㅤ↠ㅤH = (0.5)² × 500 × 10

ㅤ↠ㅤH = 0.25 × 500 × 10

ㅤ↠ㅤH = 1250

Hence,

• Current = 0.5 Ampere
• Heat energy produced in joule in 10 seconds = 1250 Joule