QUIZ # 8 15 A 20 volts potential difference maintains a 7 amperes current in a resistor. The 1. Electric current is measured in units of (9) volts, (b) coulombs, (c) amperes, (d) total energy in 5 seconds is ohms. (=) 100 joules (b) 50 joules (c) 200 joules (d) 2 joules 2.A flow of charge in a conductor requires (a) resistance. (b) a net charge, (c) a 16. Three resistors of 24 ohms, 16 ohms, and 20 ohms are connected in series with metal conductor_(d) an energy per charge difference. one another. What is the equivalent resistance of this combination? (9) 40 ohms _(b) 38 ohms (c) 80 ohms (d) 120 3. Electric current is (8) the same as potential, (b) the same as resistance, (c) the ohms same as power (d) the flow of charge through the circuit 17.Three resistors of 4 ohms, 8 ohms, and 12 ohms are connected in parallel with 4.A battery is a device that converts (9) electrical energy into mechanical energy. (b) one another. What is the equivalent resistance of this combination? chemical energy into mechanical energy, (c) chemical energy into electrical energy (8) 22 ohms _(b) 10 ohms (c) 8 ohms (d) 2 [d) none of these. ohms 5. The opposition of material to electric current flow is called (a) voltage, (b) 18. Three resistors of 24 ohms, 16 ohms, and 20 ohms are connected in series with a reactance. (c) friction_ (d) resistance. battery. A current of 3 amperes will flow through this circuit when the potential difference of the battery is 6. Electric power is equal to the (a) current times the voltage. (b) current squared (8) 20 volts _(b) 18 volts (c) 200 volts (d) 180 times the resistance (c) voltage squared divided by the resistance, (d) all of volts these. 19.How long must a 100 watt light bulb be used in order to dissipate 1000 joules of 7. Electric power is measured in units of (a) joules, (b) joules per second, (c) joules electrical energy? times seconds (d) none of these (a) 100000 sec _(b) 10000 sec (0) 100 sec (d) 10 sec 8. What is the same for each component in a series electrical circuit? (a) power, (b) current (C) voltage. (d) resistance. 20. Six thousand joules of energy is absorbed by the water from the heater in 2minutes. What is the power delivered by the heater? 8. What is the same for each component in a parallel electrical circuit? (a) resistance (=) 3000 watts (b) 1000 watts (c) 100 watts (d) (b) power (c) current, (d) voltage 50 watts 10.In a series electrical circuit the total resistance is the (a) product, (b) square, (c) sum, (d) reciprocal of the individual resistances. 11 A current of 5 A is flowing through a resistor of 20 ohms. What is the voltage difference across this resistor? (8) 4 volts _(b) 25 volts (c) 50 volts (d) 100 volts 12 A current of 2 A is flowing through a resistor with a voltage difference of 120 V across it. What is the resistance of this resistor? (a) 240 ohms _(b) 100 ohms (c) 60 ohms (d) 80 ohms 13.In a flashlight, a battery provides a total of 3 volts to a bulb. If the flashlight bulb has an operating resistance of 5 ohms, the current through the bulb is? (8) 2 A () 0.6 A (C) 15 A (d) 6A 14 A potential drop of 40 volts is measured across a 200 ohms resistor. What is the power developed in the resistor? (a) 8000 watts _(b) 5watts (c) 8 watts (d) 10 watts