A Level Electricity

Front

What is Ohm's Law?

Back

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 and inversely proportional to the resistance (R) of the conductor. It can be expressed as V = I × R.

Front

Define electric current.

Back

Electric current is the flow of electric charge, typically measured in amperes (A). It represents the rate at which charge is flowing through a conductor.

Front

What is the unit of electric resistance?

Back

The unit of electric resistance is the ohm (Ω).

Front

Explain the concept of voltage.

Back

Voltage, also known as electric potential difference, is the measure of the potential energy per unit charge available to drive the flow of current in a circuit. It is measured in volts (V).

Front

What is a series circuit?

Back

A series circuit is a type of electrical circuit in which components are connected end-to-end, so that the current flows through each component sequentially.

Front

What is a parallel circuit?

Back

A parallel circuit is a type of electrical circuit in which components are connected across common points or junctions, allowing multiple paths for current to flow.

Front

Define power in an electrical context.

Back

Electrical power is the rate at which electrical energy is transferred by an electric circuit, measured in watts (W). It can be calculated using the formula P = V × I.

Front

What is the difference between AC and DC?

Back

AC (Alternating Current) is an electric current that reverses direction periodically, while DC (Direct Current) flows in one direction only.

Front

What is Kirchhoff's Voltage Law?

Back

Kirchhoff's Voltage Law states that the sum of the electrical potential differences (voltage) around any closed network is zero.

Front

What is capacitance?

Back

Capacitance is the ability of a system to store an electric charge, measured in farads (F). It is defined as the ratio of the electric charge stored to the voltage across the plates.