Physics Current Electricity

Electric current is….

the controlled flow of electrons through a conductor

Current flows when there is a ______ between two points.

potential difference (V)

Charge pumps are

sources of energy

photo cell/ solar cell convert _____ into ____ .

light energy into electrical energy

Battery/ chemical electricity convert ______ into ______.

chemical energy into electrical energy

Generator convert ____ into _____.

mechanical energy into electrical energy (ie wind turbines)

An electric circuit is ________.

a complete conducting path through which charges can flow.

Conducting wires

used to connect components in an electric circuit, allowing the flow of electric current.

Load

a device that converts electrical power in a circuit, such as lights or appliances.

Switch

a device that opens or closes an electric circuit to control the flow of current.

Battery

a collection of one or more electric cells

Electric Cell

2 metals in a chemical solution that converts chemical energy to electrical energy

resistor

sole purpose is to reduce the flow of current in a circuit

the current flowing through a material is equal to the voltage across the material divided by its resistance

ohms law

When George Ohm increased the ______ across the wires, the _____ also increased.

voltage, current

Voltage is also called_____ ______ ______.

electric potential difference.

Voltage is named after Alessandro ____, the inventor of the electric ____.

Volta, Battery

Resistance is a measure of the _____ of _______ through a material or load.

opposition of current

4 factors that affect the resistance of a wire

1. Thickness

2. Length

3. Material

4. Temperature

The resistance of a load in a circuit is measured using a device called an _______.

ohmeter

The symbol for resistance is __.

R

The symbol for the unit “ohms” is ___.

Ω

Symbol for current is __.

A