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Download Unit 7: Electrical Circuits and Systems Review KEY
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8. If resistance is decreased in a circuit, what happens to the current? What law is this? 9. The current increases when resistance decreases. Ohm’s Law states V = IR. A motor in a toy car needs 1.2 amps of current to work properly. If the car runs on four 1.5-volt batteries, what is the motor’s resistance? 6 10. What is the voltage in a radio with 5 Ω resistance and 8 (8 )( 5 Ω) 11. Multiple devices can run at full power. Turning off one device does not affect all devices. What is the same for all points in a series circuit? In a parallel circuit? 13. 120 V What are two advantages of parallel circuits compared to series circuits? 12. of current? Current is the same for all points on a series circuit Voltage is the same for all points in a parallel circuit series circuit contains a 6Ω a. Draw the circuit. battery and three bulbs with resistances of Ω, 4 Ω, and b. What is the total resistance of the circuit? RT = R1 +R2 + R3 Ω +4Ω +6Ω 12 Ω c. What is the current in the circuit? Ω 14. A series circuit contains a 12 volt battery and two identical bulbs for 2 A of current. What is the voltage drop across each bulb? Voltage drop = 12 V/ 2 bulbs = 6 V