310102b Current Voltage and Resistance Mar 2025 (TF) (2)

Current

The flow of electrons through a complete conductive path.

Voltage

Potential energy difference between two points, measured in Volts (V).

Resistance

Opposition to electron flow, measured in Ohms (Ω).

Ohm's Law

The relationship in a circuit between Current (I), Voltage (E), and Resistance (R); expressed as I = E/R.

Coulomb

The unit of measurement for electric charge, equivalent to approximately 6.24 x 10^18 electrons.

Ampere

The unit of measurement for electric current, representing the flow of one Coulomb per second.

Conventional Flow

Describes the flow of charge through a conductor from the positive source to the negative source.

Electron Flow

Describes the movement of charge in a conductor as the flow of electrons from negative to positive.

Potential Difference

Another term for voltage, representing the difference in electric potential energy between two points.

Electromotive Force (emf)

The voltage generated by a battery or cell, resulting from a chemical reaction.

Measurement of Resistance

Requires the circuit to be de-energized and is measured with leads in parallel with the load.

Law of Electrical Charges

States that similar charges repel one another and dissimilar charges attract each other.

Electrical Circuit Components

Include a voltage source, a conductive path, and a resistance (load).

Standard Measurement of Charge

Charge is symbolized as Q and measured in Coulombs (C).

Voltage Measurement Techniques

Voltage is measured across a device and must be energized to take a reading.