Switch S has been closed for a long time, and the electric circuit shown in the

Question

Switch S has been closed for a long time, and the electric circuit shown in the figure below carries a constant current. Take C_1 = 3.00 muF, C_2 = 6.00 muF,R_1 = 4.00 kOhm, and R_2 = 7.00 kOhm. The power delivered to R_2 is 2.90 W. (a) Find the charge on C_1. (b) Now the switch is opened. After many milliseconds, by how much has the charge on C_2 changed? An electric heater is rated at 2.00 times W, a toaster at 500 W, and an electric grill at 1.00 times 10^3 W. The three appliances are connected to a common 120-V household circuit. (a) How much current does each draw? (b) If the circuit is protected with a 27.0-A circuit breaker, will the circuit breaker be tripped in this situation? Explain your answer.

Explanation / Answer

12.

Pheater = 2000 Watt

Ptoaster = 500 Watt

Pgrill = 1000 Watt

V = power supply = 120 Volts

since the appliances are in parallel , each have Voltage 120 volts across them

iheater = Pheater/V = 2000 / 120 = 16.67 A

itoaster = Ptoaster/V = 500 / 120 = 4.17 A

igrill = Pgrill/V = 1000 / 120 = 8.33 A

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