SSHS PhySci Electricity and Magnetism Review 2

Which set of conditions will produce an electric current in a closed loop of wire?

• a magnet touching the loop of wire

• a magnet at rest inside the loop of wire

• a magnet at rest outside the loop of wire

• a magnet passing through the loop of wire

In the diagram, the nail behaves just like a bar magnet when current runs through the circuit.

What will most likely happen when the switch is closed?

• A magnetic field should be produced.

• The iron in the nail should break down.

• The battery’s charge should be depleted

• Rusting should be immediately observed.

Which of the following does not affect the strength of an electromagnet?

• number of times the wire is looped around the core

• size of the object being attracted by the core

• number of batteries connected to the wire

• amount of material in the core

A magnet can generate an electric current in a wire if the magnet is close enough to the wire and if the magnet is also

• strong.

• weak.

• at rest.

• in motion.

A student wants to study the magnetic forces between three magnets. The student sets up an experiment by hanging three magnets next to each other. Which position will the magnets most likely take once the student places the magnets on the strings?

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A device that converts mechanical energy into electricity is a

• generator

• meter

• motor

• solenoid

How much power is used in an appliance rated at a current of 10 amps and a voltage of 120 volts?

• 12 W

• 1200 W

• 120 W

• 12000 W

If a clock expends 2 W of power from a 1.5 V battery, what amount of current is supplying the clock?

• 1.3 A

• 0.75 A

• 3 A

• 3.5 A

A juicer uses 90 W of power, with a 4.5 A supply of current. How many volts are necessary to run the juicer?

• 10 V

• 20 V

• 15 V

• 5 V

How much power is needed to run an amplifier that used 12 amps of energy and had a resistance of 4 ohms?

• 48 W

• 192 W

• 576 W

• 12 W