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Current Electricity

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**An electrical current is a flow of charged particles (electrons or ions) through a circuit**

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In a circuit with a battery or chemical cell, electrons flow from a negative terminal to a positive terminal through the circuit

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**Conductors are materials through which a current can flow**

Metals are good conductors Other materials like carbon or water are also good conductors

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**Schematic diagrams are diagrams of electric circuits**

Symbols are used to represent different parts of an electrical circuit

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Schematic Diagram

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**Series and Parallel Circuits**

Series circuits have a single pathway for the current Parallel circuits have more than one pathway for the current

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**Meters are used to measure current, voltage or resistance in a circuit**

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Current a measure of the number of charged particles passing a point in a given time measured in amperes (A) or amps 1A = 1 coulomb of charge per second Symbol for current is I

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**An ammeter is used to measure current in a circuit**

Ammeters are connected in series

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Conventional Current In an electric circuit, electrons actually flow from the negative terminal to the positive terminal In conventional current, we assume they are flowing from positive to negative

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Voltage a measure of the amount of electrical energy carried by each charged particle in a circuit measured in Volts (V)

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**A voltmeter is used to measure voltage**

A voltmeter is connected in parallel

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**Resistance A resistor resists the flow of current in a circuit**

Resistors convert electrical energy into other forms such as heat or light Resistance (R) is measured in Ohms (Ω) Resistance

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