Question

An electric heater of resistance 500 ohm is connected to a mains supply for 30 mins if 15a current flows through the filament of the heater, then calculate the heat energy produced in heater

Answer 1

Given:-

• Resistance,R = 500 ohms

• Time take, t= 30 mins =30 × 60 = 180 Seconds

• Current,I = 15A

To be calculated:-

Calculate heat energy produced in heater.

Formula used:-

Heat energy = I² × R × t

Solution:-

We know that,

H= l² × R × t

★ Substituting the values in the above formula,we get:

H = ( 15 )² × 500 × 180

H = 225 × 500 × 180

H = 112,500 × 180

H = 20,250,000

H = 2025 × 10⁵ Joules

Hence,the heat energy produced in the heater is 2025 x 10⁵ Joules.

Additional information:-

★ Another formulas :

• H = V × I × t

• H = V² × t / R

Current : Rate of flow charge is called current.

• Current = Q / t

• S.I unit is Ampere ( A )

• Instrument used to measure current = Ammeter