Question

Calculate The amount of heat produced in an electric heater of resistance 1500 ohm ohm if 6 ampere current is passed through it for 20 minutes

Answer 1

20 mins = 20/60 hours = 1/3 hours

we knew,

$h \: = i {}^{2} rt$

$= 36 \times 1500 \times 1 \div 3$

$= 18000joules$