Defines electrical current, voltage, resistance, and explains the use of ammeter and voltmeter in circuits.
Electrical current, denoted by I, is defined as the rate of flow of charge through a circuit. Potential difference or voltage, denoted by V, is the amount of energy per unit charge needed to move that charge between two points in a circuit.
Resistance of a conductor is a measure of how much it resists the flow of electric current. It is represented by the symbol R in Ohm's Law: V = IR where V is voltage, I is current, and R is resistance.
An ammeter is used to measure the current flowing through a circuit, connected in series. A voltmeter measures the potential difference across components in a circuit, connected in parallel to measure the voltage. The major difference is in their placements in the circuit - ammeters are in series, while voltmeters are in parallel.
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