front 1 the buildup of electric charges on an object is called a _________ charge | back 1 static |
front 2 two objects will attract one another when they have ___________ charges | back 2 opposite |
front 3 one example of a good conductor is _______ | back 3 copper |
front 4 the steady flow of electrons through a conductor is an electric _____________ | back 4 current |
front 5 when the resistance in an electrical circuit increases, the current flowing in the circuit _________ | back 5 decreases |
front 6 resistance is measured in a unit called the ____ | back 6 ohms |
front 7 a path created for a current that allows only one route for the current is called a __________ current | back 7 series |
front 8 a _________ breaker is a device designed to open an overload circuit and prevent overheating | back 8 circuit |
front 9 electric companies usually sell electrical energy in units of ____ | back 9 kWh |
front 10 a circuit that has more than two or more separate paths for electrons to follow is a(n) ___________ circuit | back 10 parallel |
front 11 the south pole of a magnet attracts the ______ pole of another magnet | back 11 north |
front 12 when you break an iron magnet into two pieces, you get two ____________ | back 12 magnets |
front 13 the region around a magnet where the magnetic forces act is the ________________ | back 13 magnetic field |
front 14 the magnetic field of a magnet is strongest at the ________ | back 14 poles |
front 15 an electromagnet is only operating when the current is ___ | back 15 on |
front 16 the function of an electric motor is to change ____________ energy to _____________ energy | back 16 electrical; mechanical |
front 17 a current carrying wire wrapped around an iron ore is called a(n) _______________ | back 17 electromagnet |
front 18 current that does NOT reverse direction is called _______________________ | back 18 direct current |
front 19 a simple complete circuit must have wires connected to a __________ and an ___________________ | back 19 load; energy source |
front 20 when you walk across a carpeted floor and then touch a metal doorknob, the "shock" you may feel occurs because of a(n) static _____________ | back 20 discharge |
front 21 when you rub a balloon on your hair, __________ go from your hair to the balloon | back 21 electrons |
front 22 in a battery, electrons flow from the _________ terminal to the ___________ terminal | back 22 negative; positive |
front 23 a wire that is long and _________ would have the greatest electrical resistance | back 23 thin |
front 24 two identical balloons are both rubbed with wool. If the balloons are brought near each other, they will ________ each other | back 24 repel |
front 25 the core of an electromagnet is usually made of ______ | back 25 iron |
front 26 a magnetic field exists around a wire whenever a ________ flows through the wire | back 26 current |
front 27 earth's magnetic field is called the _________________ | back 27 magnetosphere |
front 28 List and describe the three essential parts of a circuit | back 28 1) wires- conducts current
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front 29 describe how direct current differs from alternating current | back 29 direct currents- only travels in one direction
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front 30 how does lightning form? | back 30 1) charges build up in clouds
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