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Electric Current: BasicsPowerPoint Presentation

Electric Current: Basics

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Electric Current: Basics

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Electric Current: Basics

- Current electricity is like current in a river.
- A high or fast river current means the water is rushing past the shore quickly.
- A high current in electricity means that the electrons are moving past points in the circuit quickly.

- Electrons keep moving around the circuit with a constant source of energy (ex. Battery, power outlet, etc.)
- Energy gives the electrons a ‘push’

- Current: the rate of electron flow past a given point in a circuit

- Symbol: I
- Units: Amperes (A)
- Measured with: Ammeter

- Potential Difference/Voltage: the difference in electrical energy per unit charge measured at two different points
- Symbol: V
- Units: Volts
- Measured with: Voltmeter

- An electric circuit is a continuous path through which an electric current is passed
- Electric circuits convert electrical energy into other forms of energy we need – such as heat or light.

- There are five basic parts found in a simple electric circuit.

- Energy Source
- Provides electrical energy in a circuit
- E.g. battery, electrical outlet

Battery

(energy source)

- Load
- An electrical device that converts electrical energy into another form
- E.g. light bulb, motor

Light Bulb

(load)

- Switch
- A control device that opens or closes a circuit

Switch

- Connectors
- Conducting wires carry the electrical energy

Connectors

- Meters
- Measure current (ammeter) andpotential difference (voltmeter)

Ammeter

Voltmeter

Energy Source – One Battery

One Battery

(One Dry Cell)

Two Batteries

(Two Dry Cells)

Light Bulb

Light Bulb

Motor

Open Switch

Closed Switch

Conducting wire

Voltmeter

Ammeter

Resistor