Electric current

Current is...

• moving protons
• moving electrons
• measured in volts
• measured in ohms

An object through which electrons can easily flow is called a(n) ___________.

• Conductor
• Insulator

The unit for the rate of current is the ______________.

• ampere
• volt
• ohm
• joule

Metals such as copper and aluminum are good ______________. 

• insulators
• conductors
• circuits
• charges

The symbol for 1 _____ is A

• acceleration
• current
• ampere
• coulomb

Why is a battery important in an electrical circuit?

• As a source of energy.

• As a path for electricity to flow through.

• As a connector to connect all parts of a circuit.

The diagram shows a complete circuit but the bulb did not light up. Why?

• The plastic spoon is an insulator of electricity and prevented electric current from flowing through the circuit.

• The plastic spoon is not connected properly and prevented electric current from flowing through the circuit.

• The plastic spoon is a conductor of electricity and prevented electric current from flowing through the circuit.

Why electrical wiring usually are covered with a layer of plastic?

• To make it look pretty

• To help electricity flow along the wire

• To make it safe

• To add more energy

A device for making or breaking an electric circuit.

• Cell

• Filament

• Electric switch

The direction of current flow is taken from

• negative to positive terminal

• Positive to negative terminal

• Both