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Quarter 3 Test 2 Review 1 Typically, household appliances operate at 120 volts. What is the current flowing in the circuit of a microwave when the resistance of the microwave oven is 30 ohms? 2 If the current moving through the filament of a light bulb is 0.5 amps when the voltage across the bulb is 120 volts, what is the resistance of the bulb? 3 A miniature light bulb with a resistance of 3 ohms is connected to a 6-volt source. How much current will flow through the bulb? 4 A student connects three 1-ohm light bulbs to a 9volt battery in parallel. The total circuit current is ____ ampere(s). 5 What does Kirchoff's current law state 6 The wiring in your home uses ____ circuits 7 A student connects six 3-ohm light bulbs in series to a 9-volt battery. The total circuit current is ____ ampere(s). 8 Suppose you connect more and more light bulbs in series to a battery. What happens to the brightness of each bulb as you add more bulbs? 9 A stereo receiver is plugged into a 120-volt outlet. If the receiver has a resistance of 240 ohms, how much current does it use? 10 As Jing toasts her morning waffle in the family toaster, 4.0 amps of current flows with a voltage of 120 volts across the toaster. The resistance of the toaster is _______. 11 An ohm is the unit of measurement for_______. 12 In an electrical circuit, the term current refers to what? 13 The motion of charges in wires, motors, light bulbs and other devices is best called electric______. 14 Use the series circuit pictured to the right to answer questions (a), (b), and (c). a. What is the total resistance of the circuit? b. What is the current in the circuit? c. What is the voltage drop across each resistor? 15 Use the series circuit pictured right to answer questions (a), (b), and (c). Consider each resistor equal to all others. a. What is the resistance of each resistor? b. What is the voltage drop across each resistor? 16 Use the parallel circuit pictured right to answer questions (a) - (d). a. What is the voltage across each resistor? b. What is the current in each branch? c. What is the total current provided by the batteries? d. Use the total current and the total voltage to calculate the total resistance of the circuit. 17 Calculate the equivalent resistance of: a. Three 8 Ω resistors in parallel b. Two 6 Ω resistors and a 2 Ω resistor in parallel c. A 1 Ω, a 2 Ω, and a 3 Ω resistor in parallel 18 A toaster is plugged into a 120-volt household circuit. It draws 5 amps of current. a. What is the resistance of the toaster? b. What is the power of the toaster in watts? c. What is the power in kilowatts? 19 A clothes dryer in a home has a power of 4,500 watts and runs on a special 220-volt household circuit. a. What is the current through the dryer? b. What is the resistance of the dryer? c. How many kilowatt-hours of electricity are used by the dryer if it is used for 4 hours in one week? d. How much does it cost to run the dryer for one year if it is used for 4 hours each week at a cost of $0.15/kWh? 20 A. In your own words, state the relationship between resistance and current in a circuit. B. In your own words, state the relationship between voltage and current in a circuit.