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Chap. 13 Electricity Answer Key

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Electric Circuits
#1 What flows and carries power in a circuit? electric current
#2 An --------------- has a break in it, so there is no current. open circuit
#3 These are used when drawing a circuit diagrams. electric symbols
#4 A ------------ has a complete path for the current and contains no break. closed circuit
#5 A light bulb,motor, or speaker acts as a ---------------- in a circuit. resistor
Electric Circuits
#1 What is the purpose of an electric current? create energy to turn things on
#2 What is the purpose of a switch within a circuit? turn circuits off and on
#3 The motion of charges or electrons flowing in wires, motors, light bulbs and other devices is best called electric --------- electric current
#4 Components called ----------- are used to control current in the circuits on the board. resistors
#5 If you compare an electrical circuit to a system that carries water, what would the water pipes represent? wires
Current and Voltage
#1 The unit for current is the ____________ amps
#2 A _________ provides voltage to a circuit. battery or electrical outlet
#3 Current leaves a battery from the __________ end and returns to the _________end. positive, negative
#4 What tool is used to only measure current? ammeter
#5 What happens to the current in a circuit if you increase the resistance? current decreases
Resistance and Ohms Law
#1 What unit is resistance measured in? Ohm's
#2 The ability of an object to resist the flow of current is ____________ resistance
#3 The relationship of voltage equal to current multiplied by resistance is known a ___________ law. Ohm's
#4 Wires in a circuit are made of a material that is a ______________ conductor
#5 A simple method of describing a real circuit using electrical symbols is called a ________________ circuit diagram
Random
#1 The ___________ is the unit for measuring voltage. volts
#2 What is the name of the symbol that is used to represent Ohms? omega
#3 Plastic, rubber, and glass are examples of _____________ insulators
#4 What 2 measurements can a multimeter measure? voltage and current
#5 How many volts do household batteries have? 1.5 Volts
Final Question