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Introducing Electricity by Mind Map: Introducing Electricity
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Introducing Electricity

Sources of Electricity

Mains electricity

Power station --> Homes & Industries --> wires --> mains socket

Electric cells

Electricity = Electrical Energy (It is a form of energy)

Parts of a Circuit

the rate of flow of electric charges / the flow of electrons in one direction in a circuit = electric current

the path taken by the electric current = electric circuit

electrical components

open/closed circuit

Conductors & Insulators

Electrical Conductors: - copper - iron - aluminum

Electrical Insulators: - plastic - rubber - glass - wood

Circuit Arrangement

Series

The current that flows through each component is the same.

When one bulb is removed or broken, the remaining bulbs will no light up.

Parallel

The current from the battery divides and flows through each branch.

When one bulb is removed or broken, the other bulbs remain lit.

Measuring Electric Current

SI unit = ampere (A)

Use an ammeter.

Also measure in milliamperes (mA)

Connected in series.

Positive (red terminal) - Positive (cell side) Negative (black terminal) - Negative (cell side)

Measuring Voltage

SI unit = volt (V)

It is the difference in potential energy between 2 point.

Use an voltmeter.

measures the energy the electrons receive.

Connected in parallel.

Positive (red terminal) - Positive (cell side) Negative (black terminal) - Negative (cell side)

In Singapore, mains voltage is 230V.

Measuring Resistance

SI unit = ohm ( Ω)

The greater the resistance in a circuit, the lower the current.

A force put up by electrical components against the flow of electrons.