Electricity and Circuits Review

Front

What is a resistor?

Back

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

Front

What is the unit of resistance?

Back

The unit of resistance is Ohm (Ω).

Front

What does a voltmeter measure?

Back

A voltmeter measures the voltage (potential difference) across two points in a circuit.

Front

What is the formula for calculating resistance using voltage and power?

Back

Resistance (R) can be calculated using the formula R = V^2 / P, where V is voltage and P is power.

Front

What happens in a series circuit when one component fails?

Back

In a series circuit, if one component fails, the entire circuit is broken and all components stop working.

Front

What is a parallel circuit?

Back

A parallel circuit is a type of electrical circuit where components are connected across common points, allowing multiple paths for current.

Front

What happens to the total resistance in a parallel circuit when more resistors are added?

Back

The total resistance decreases when more resistors are added in a parallel circuit.

Front

What is the effect of adding an extra battery in a circuit?

Back

Adding an extra battery increases the voltage, which can make the lights glow brighter.

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, expressed as V = IR.

Front

What is the difference between series and parallel circuits?

Back

In a series circuit, components are connected end-to-end, while in a parallel circuit, components are connected across the same voltage source.