If a resistor of 15 Ω carries a current of 2.5 A for 12 seconds, the heat produced is _____ joules.

Correct option is C

Given :

$$I = 2.5A$$  

R = 15Ω

t = 12 seconds

Formula used: 

$$Q = I^2Rt$$ 

I is the current ( in amperes),

R  is the resistance (in ohms),

t is the time ( in second).

Solution: 

$$Q = (2.5)^2 \times 15 \times 12$$ 

$$Q = 6.25 \times 15 \times 12$$ 

$$Q = 1125joules$$ 

So, the heat produced is 1125 joules.