Aurora Public Schools – Aurora, Colorado | 303-344-8060



Name _______________________________________True/FalseIndicate whether the statement is true or false.____1.A substance that slows the movement of electrons is called a conductor.____2.A fuse or circuit breaker places a restriction on the amount of current that can flow in a home.Multiple ChoiceIdentify the choice that best completes the statement or answers the question.____3.A light bulb transforms electrical energy into:____4.A generator transforms:____5.The output energy of a generator:____6.The ohm is a unit of electrical:____7.The volt is a unit of electrical:____8.The ampere, or amp, is a unit of electrical:____9.The watt is a unit of electrical:____10.The equation P = IV is used to calculate electrical:____11.Both a joule and a watt-second are units of:____12.One ampere, or amp, equals:____13.One volt equals:____14.One watt equals:____15.What is the maximum current for a 120-volt circuit rated at 2,400 watts?____16.If the current flow in a 120-volt vacuum cleaner is 5 amps, what is the power of the vacuum cleaner?____17.In a simple electric circuit, a 110-volt electric heater draws 2.0 amperes of current. What is the resistance of the electric heater?____18.Which circuit diagram below correctly shows the connection of ammeter A and voltmeter V to measure the current through and potential difference across resistor R?____19.Identical resistors R are connected across the same 12-volt battery. Which circuit uses the greatest power?____20.A charge of 5.0 coulombs moves through a circuit in 0.50 second. What is the current in the circuit?____21.An operating electric iron draws a current of 5 amperes and has a resistance of 20 ohms. How much energy does the iron use when operating for 40 seconds?____22.In the circuit below, what are the correct readings of the voltmeters V and V?____23.What is the total electrical energy used by a 1,500-watt hair dryer operating for 6.0 minutes?____24.In the diagram below, lamps L and L are connected to a constant voltage power supply. If lamp L burns out:____25.An operating electric heater draws a current of 10. amperes and has a resistance of 12 ohms. How much energy does the heater use in 60. seconds?____26.How much current flows through a 12-ohm flashlight bulb operating at 3.0 volts?____27.Which device controls the flow of electrons in an electric circuit?____28.As the amount of current produced by a hand-operated generator increases:____29.A resistor is placed in a circuit. The current in the circuit is 2 amperes and the voltage drop across the resistor is 8 volts. The voltage is then increased to 12 volts. What will be the new current?____30.Your hairdryer has a resistance of 9.6 ohms and you plug it into the bathroom outlet. The household voltage is 120 volts. If your sister plugs in an identical hairdryer into the same circuit, how much current will the two hairdryers draw?____31.A resistor of 6 ohms is placed in a circuit. The voltage drop across the resistor is 12 volts. What is the current through the resistor?____32.The current in a circuit is 3 amperes and the voltage drop across the resistor is 12 volts. What is the value of the resistor in the circuit?____33.Three wires were tested in a laboratory setting. The current was measured as the voltage across the wire was varied. The results of the experiment appear in the graph below. All three wires obey Ohm’s Law. Which wire has the greatest resistance?____34.How much current must be flowing through a 60.-watt light bulb when it is operating in a 120-volt household circuit?____35.A 12-volt car battery supplies 48 amperes of current to the car’s starter. What is the power output of the car battery?____36.A light bulb has a resistance of 240 ohms. If the bulb is connected to a 120-volt source, what is the power output of the light bulb?____37.A 120-volt circuit for a kitchen of a home is protected by a 20-ampere circuit breaker. What combination of the following appliances would most likely cause the circuit breaker to trip? AppliancePower demand (watts)toaster1,000frying pan1,200blender300coffeemaker600____38.How many 60.-watt incandescent light bulbs can be operated at the same time on a 120-volt, 15-ampere circuit in a home?____39.A 3.0-watt wall clock operates at 120 volts. How much current does the clock draw?____40.Which current reading would be on the ammeter in the circuit represented in the diagram below?____41.A 12-volt car battery supplies 45 amperes of current to the starter of the car. If the starter draws energy for 14 seconds, how much energy does the starter use?____42.A student uses a 1,500-watt hair dryer for 5.0 minutes every morning to dry his hair. How much electrical energy is the student changing to heat?Short Answer43.Which kind of electric circuit would you choose for household wiring, parallel or series? Please explain your answer. ................
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