Electric Currents

What do fuel cells, batteries, and solar cells have in common?

• They all produce static electricity

• They are all sources of direct current

• They are all sources of alternating current

• They can all be used to power automobiles

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What can you infer about this source of electricity?

• It is a source of alternating current

• It is a source of direct current

• It is a source of static electricity

• It is a source of electromagnetic radiation

How does alternating current differ from direct current?

• Alternating current produces more voltage than direct current

• Alternating current always flows in the same direction; the direction of a direct current switches back and forth

• Direct current produces more voltage than alternating current

• Direct current always flows in the same direction; the direction of an alternating current switches back and forth

How does electricity travel from power plants to your house?

• It travels through the air as electromagnetic waves

• Through a series of generators

• Through a series of many transformers

• Through transmission wires

What is the function of every generator on Earth?

• Changing wind energy into electrical energy

• Changing heat energy into electrical energy

• Changing mechanical energy into electrical energy

• Changing solar energy into electrical energy

How does a generator create current?

• By using an electromagnet

• By using an internal combustion engine

• By using a fan

• By using energy from the sun

Place the following events in sequence: A) Voltage is increased by a transformer; B) Voltage is decreased by a transformer; C) Electrical current enters your home

• A, B, C

• B, A, C

• A, C, B

• B, C, A

Which of the following are sources of mechanical energy?

• Cars and trucks

• Radios and televisions

• Transmission lines and transformers

• Wind and fossil fuels

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What is the main function of a turbine?

• Producing a magnetic field

• Spinning

• Reducing the voltage of an electrical current

• Increasing the voltage of an electrical current

What is one possible reason why it's a good idea to conserve electricity?

• It is often produced by burning fossil fuels, which are a polluting, non-renewable resource.

• Power companies only give each home a limited amount of electricity every day.

• Using too much electricity can start dangerous electrical fires.

• Using too much electricity can cause power plants to break down.

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