Current electricity key terms

Current

The rate of flow of electric charge, measured in amperes (A). In Current electricity, use this term precisely by linking it to the relevant circuit quantity, measurement unit, and physical relationship rather than treating it as a generic label.

Charge

A property of matter that causes it to experience a force when placed in an electromagnetic field, measured in coulombs (C).

Potential Difference

The energy transferred per unit charge between two points in an electric circuit.

Charge

A property of matter that causes it to experience a force when placed in an electromagnetic field.

Ohm's Law

The relationship between voltage (V), current (I), and resistance (R) in a conductor, expressed as V = I x R.

Electrical Power

The rate at which electrical energy is transferred, calculated using the formula P = V x I, where P is power, V is potential difference, and I is current.

Electrical Power

The rate at which electrical energy is transferred by an electric circuit, calculated using the formula P = V x I, where P is power in watts, V is potential difference in volts, and I is current in amperes.

Energy Transfer

The process of transferring energy from one form to another or from one system to another, often quantified in joules, and can be calculated using various equations depending on the context, such as E = P x t for electrical energy.

I-V graph

A graphical representation showing the relationship between current and potential difference for an electrical component.

ohmic conductor

A conductor that follows Ohm's law, where the current is directly proportional to the potential difference across it.

I-V characteristic

A graphical representation showing the relationship between current and potential difference in a component.

filament lamp

A type of lamp that uses a thin wire filament which glows when an electric current passes through it, demonstrating non-ohmic behavior.

I-V characteristic

A graphical representation of the current (I) flowing through a diode versus the potential difference (V) across it, illustrating the diode's behavior under different voltage conditions.

diode

A semiconductor device that allows current to flow in one direction only, characterized by its non-linear I-V characteristic.

Ohmic behaviour

Ohmic behaviour refers to the characteristic of a conductor where the current flowing through it is directly proportional to the potential difference across it, following Ohm's Law (V = I × R).

Non-ohmic behaviour

Non-ohmic behaviour describes materials or components where the current does not have a linear relationship with the potential difference, meaning that resistance changes with voltage or current.

Resistivity

Resistivity is a material property that quantifies how strongly a given material opposes the flow of electric current, typically measured in ohm-meters (Ω·m).

Ohm's Law

Ohm's Law states that the current (I) through a conductor between two points is directly proportional to the voltage (V) across the two points, expressed as V = I × R, where R is the resistance in ohms (Ω).

Resistivity

A material property that quantifies how strongly a given material opposes the flow of electric current, defined as R = ρ (L/A), where R is resistance, ρ is resistivity, L is length, and A is cross-sectional area.

Ohm's Law

A fundamental principle in electricity stating that the current (I) through a conductor between two points is directly proportional to the voltage (V) across the two points, expressed as V = I × R, where R is the resistance.

Resistance

The opposition to the flow of electric current, measured in ohms (Ω). In Current electricity, use this term precisely by linking it to the relevant circuit quantity, measurement unit, and physical relationship rather than treating it as a generic label.

Resistivity

A material property that quantifies how strongly a given material opposes the flow of electric current, measured in ohm-meters (Ω·m).

Resistivity

A material property that quantifies how strongly a given material opposes the flow of electric current, defined by the formula ρ = R × (A/L), where ρ is resistivity, R is resistance, A is cross-sectional area, and L is length.

Resistance

The opposition to the flow of electric current in a conductor, measured in ohms (Ω), calculated using Ohm's law as R = V/I, where R is resistance, V is potential difference, and I is current.

Conservation of Charge

The principle stating that the total electric charge in a closed system remains constant over time.

Current

The rate of flow of electric charge, measured in amperes (A), defined as the amount of charge (C) passing a point in a circuit per unit time (s).

conservation of energy

The principle stating that energy cannot be created or destroyed, only transformed from one form to another.

potential difference

The work done per unit charge in moving a charge between two points in an electric field, measured in volts (V).

Total Resistance in Series Circuits

The total resistance (R_total) in a series circuit is the sum of the individual resistances (R1, R2, ...). Formula: R_total = R1 + R2 + ...

Total Resistance in Parallel Circuits

The total resistance (R_total) in a parallel circuit is found using the formula: 1/R_total = 1/R1 + 1/R2 + ... which results in a lower total resistance than any individual resistor.