Circuit

Front

What is an electric circuit?

Back

An electric circuit is a closed loop that allows electric current to flow, consisting of a power source, conductors, and loads.

Front

Define current in the context of a circuit.

Back

Current is the flow of electric charge, measured in amperes (A), and represents the rate at which charge is flowing through a conductor.

Front

What is resistance in a circuit?

Back

Resistance is a measure of the opposition to the flow of current in a circuit, measured in ohms (Ω).

Front

Explain 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): V = I × R.

Front

What is a capacitor?

Back

A capacitor is a passive electrical component that stores electrical energy in an electric field, characterized by its capacitance (C), measured in farads (F).

Front

What happens to the voltage across a capacitor when it is connected to an uncharged capacitor?

Back

The voltage across the initially charged capacitor decreases as charge is shared with the uncharged capacitor until equilibrium is reached.

Front

Define the term 'emf' in a circuit.

Back

Electromotive force (emf) is the voltage generated by a battery or other energy source in a circuit, which drives the current.

Front

What is the role of a resistor in a circuit?

Back

A resistor limits the flow of electric current in a circuit, allowing for control of voltage and current levels.

Front

How does closing a switch in a circuit affect current flow?

Back

Closing a switch completes the circuit, allowing current to flow through the circuit components.

Front

What is the relationship between voltage, current, and resistance?

Back

According to Ohm's Law, voltage (V) = current (I) × resistance (R).