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Published byBrianna Ellis Modified over 5 years ago

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What is Electricity? Electricity is the flow of moving electrons. When the electrons flow it is called an electrical current.

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Cells and batteries

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Cells and batteries

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Electric Current Electric current is the rate at which charges pass a given point. When the current is high, more charges pass the point each second.

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**Electric Current Symbol of current in formula: I**

Units: amperes or amps Symbol of amperes or amps: A

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AC/DC There are two types of electric current: Alternating Current (AC) and Direct Current (DC)

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**Voltage is the potential difference between two points in a circuit.**

Voltage is the potential energy that makes the electrical current flow in a circuit by pushing the electrons around.

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**Symbol of voltage in formula: V**

Units: volts Symbol of volts: V

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Voltage A measure of how much work is needed to move a charge between two points. The size of the current depends on the voltage. If the voltage between two points on a wire is increased, more current will flow in the wire.

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**Resistance is the opposition to the flow of electric charge.**

What is a resistance? Resistance is the opposition to the flow of electric charge.

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**Symbol of resistance in formula: R**

Units: ohms Symbol of ohms: Ω

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**Conductors and insulators**

A conductor in electricity is a material that allows electrons to flow through it easily. Metals, in general, are good conductors. An insulator is a material that is a poor conductor of electricity. Examples include plastic, wood, ceramic and glass.

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**Symbol of conductance in formula: G**

Units: Siemens Symbol of ohms: S To calculate conductance in terms of Resistance, we use this formula: R= 1/G G= 1/R

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V R I V = I x R I = V / R R = V / I

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Exercises What current flows between a potential difference of 120 V through a resistance of 30 Ω? A motor with an operating resistance of 30 Ω is connected to a voltage source. 4.0 A of current flow in the circuit. What is the voltage of the source? If the conductance of a circuit is 0.25 S, and the current is 2.0 A, what is the overall voltage? An ammeter measures current. What will the ammeter read when it is connected to a 90 V source and a 60 Ω resistor?

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Electrical Power The rate at which electrical energy is changed into other forms of energy. The watt tells how quickly a device (e.g. bulb) uses electrical energy. Symbol of power in formula: P Units: watts (Joules/s) Symbol of watts: W Power= voltage x current

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