Electricity Test Review

What causes current to flow? voltage

An example of a voltage source is a(n) _____. battery

If two wires of the same material have the same thickness but different lengths, the _____ wire will have greater resistance. longer

Adding bulbs to a _____ circuit causes all of the bulbs to shine less brightly. series

What is the disadvantage of using fuses? They are not reusable

In a _____ circuit, there is only one path for the current to take. series

What voltage produces a current of 50 amps with a resistance of 20 ohms? 1000 volts

The purpose of having circuit breakers or fuses is: prevent an overload in the circuit

A type of current that flows in one direction is _____. Direct current

When a balloon is charged, it will pick up small pieces of paper that lie within an inch of it. Predict what would happen if the balloon was moved away from the paper by two inches. the strength of the static force would decrease

The build-up of charges on an object is called_____. Static Electricity

Unlike charges will _____. attract

Resistance in circuits is measured in: ohms

Using the equation: I=V/R Predict what happens to the current if the resistance is doubled. the current will decrease

If a short circuit exists on a line, what is the probably outcome? The electron flow goes around the load so that it doesn’t work.

When purchasing a battery, the unit given as volts represents: voltage

Electric charges that are the same _____. repel each other

What resistance would produce a current of 200 amps and a voltage of 2000 volts? 10 ohms

Electrical power plants use _________ current to send electricity long distances. alternating

A _________ takes place within a battery to produce a voltage. chemical reaction

What is the current produced by 120 volts and a resistance of 50 ohms? 2.4 amps

Power companies measure the amount of current used in _______________ units. Kilowatt-hour

Electrons flow _______ from the negative end of a voltage source. Negative