A car radio draws 0.10 A of current in the auto\'s 12-Velectrical system. a) How

Question

A car radio draws 0.10 A of current in the auto's 12-Velectrical system. a) How much electric power does the radio use? _____W b) What is the effective resistance of the radio?_____ An electrical component has two resistances of 20 and50 connected in parallel. a) What is the total resistance of the component?____ b) If connected to a 120-V source, how much current wouldthere be in each resistor? 20 resistor: _______A 50 resistor: ________A A car radio draws 0.10 A of current in the auto's 12-Velectrical system. a) How much electric power does the radio use? _____W b) What is the effective resistance of the radio?_____ An electrical component has two resistances of 20 and50 connected in parallel. a) What is the total resistance of the component?____ b) If connected to a 120-V source, how much current wouldthere be in each resistor? 20 resistor: _______A 50 resistor: ________A

Explanation / Answer

a ) Electric Power is P = I V                                        = 0.10 A * 12 V                                         = 1.2 W b ) Effective Resistance   R = V / I                                               = 12 V / 0.10 A                                                 = 120 c ) Total Resistance Req =R1R2 /R1+R2                                             =20*50 /20+50                                            = 14.2 d) For 20 I = V/R1                          = 120V / 20                            = 6 A    For 50 I = V /R2                          = 120V / 50                            = 2.4A                          = 120V / 50                            = 2.4A

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