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An electrical current is a flow of charged particles (electrons or ions) through a circuit
In a circuit with a battery or chemical cell, electrons flow from a negative terminal to a positive terminal through the circuit
Conductors are materials through which a current can flowMetals are good conductors Other materials like carbon or water are also good conductors
Schematic diagrams are diagrams of electric circuitsSymbols are used to represent different parts of an electrical circuit
Series and Parallel CircuitsSeries circuits have a single pathway for the current Parallel circuits have more than one pathway for the current
Meters are used to measure current, voltage or resistance in a circuit
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
An ammeter is used to measure current in a circuitAmmeters are connected in series
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
Voltage a measure of the amount of electrical energy carried by each charged particle in a circuit measured in Volts (V)
A voltmeter is used to measure voltageA voltmeter is connected in parallel
Resistance A resistor resists the flow of current in a circuitResistors convert electrical energy into other forms such as heat or light Resistance (R) is measured in Ohms (Ω) Resistance
Current Electricity & Ohm's Law.
Cells have positive and negative electrodes.
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