Circuits STAAR

Front

What is a circuit in electrical terms?

Back

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

Front

What is the difference between a series circuit and a parallel circuit?

Back

In a series circuit, components are connected end-to-end, so the same current flows through all components. In a parallel circuit, components are connected across common points, allowing multiple paths for current.

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, expressed as V = IR.

Front

What is the role of a resistor in a circuit?

Back

A resistor is a component that resists the flow of electric current, creating a voltage drop and controlling the current in the circuit.

Front

What is the function of a capacitor in a circuit?

Back

A capacitor stores electrical energy temporarily and releases it when needed, helping to smooth out fluctuations in voltage.

Front

What is the purpose of a fuse in an electrical circuit?

Back

A fuse is a safety device that protects a circuit by breaking the connection if the current exceeds a certain level, preventing overheating and potential fires.

Front

What is the difference between direct current (DC) and alternating current (AC)?

Back

Direct current (DC) flows in one direction, while alternating current (AC) changes direction periodically.

Front

What is a short circuit?

Back

A short circuit occurs when there is a low-resistance connection between two points in a circuit, allowing excessive current to flow, which can cause damage.

Front

What is the function of a switch in a circuit?

Back

A switch is a device that can open or close a circuit, controlling the flow of current.

Front

What is electrical power and how is it calculated?

Back

Electrical power (P) is the rate at which electrical energy is consumed or produced, calculated using the formula P = IV, where I is current and V is voltage.