Question

An electric heater is rated at 1500 W, a toaster at 750 W, and an electric grill at 1000 W. The three appliances are connected to a common 120 V circuit. Calculate the current used by the three appliances if all three are on at the same timee

Answer 1

Answer:

   I= 27.09 A

Explanation:

Power of electric heater = 1500W= 1.50*10³ W

Power of toaster = 750W = 7.5*10²W

Power of electric grill = 1000W =1*10³ W

Voltage = 120V

By using formula P=VI ie I = $\frac{P}{V}$

A) Current used by electric heater I₃ =$\frac{1.50*10^3}{120}$

                    I₃ = 12.5 A

B) Current used by toaster I₂ =$\frac{750}{120}$

                I₂ = 6.25 A

C) Current used by electric grill I₃ = $\frac{1000}{120}$

                   I₃ = 8.34 A

Current used by all three appliances is

       I=I₁+I₂+I₃

        I=12.5+6.25+8.34

         I= 27.09 A