# Electric current

Electric current, voltage, resistance

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## Basics on Current, voltage and resistance

Current - rate of flow of charge carried by electrons around a circuit. Electrons are negatively charged, so get attracted to a positive battery. Symbol I, measured in Amps!

Voltage - Causes electrons to flow around the circuit. Bigger the voltage, the faster the electrons flow (bigger current). Positive energy that makes electrons move. Symbol: V Measured in: volts

Electricity - Movement of electrons around a circuit.

Charge - (+ or -) Electrons have negative charge -. Charge carried by electrons.

Electrons move randomly when there is no current.

Electrons go from - to +. Conventional current goes from + to -.

Electrons attracted to nucleus because nucleus is + charge and electrons are - charge.

Provide a cell to create positive and negative charge throughout a circuit.

Increase the VOLTAGE -- MORE CURRENT will flow.

Increase RESISTANCE -- LESS CURRENT will flow.

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## Series and Parallel cicuits

SERIES CIRCUIT

One path for electrons to flow.

By def. conventional current flows from - to +. Electrons flow from - to +.

Electrons are attracted to the positive of the battery.

Faster the electrons, the greater the current.

AMMETER - always connected in series. VOLTMETER - Always connected in parallel circuit to component.

Current is the same throughout circuit.

PARALLEL CIRCUIT

Two or more paths for the current to flow. Current splits between each available path.

Resistance reduces current. Current splits in a parallel circuit. Look towards circuit diagrams for more on this!

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