Cambridge O Level Physics: Electric Circuits

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Questions and Answers

What is true about the current in a series circuit?

The current at every point is the same. (correct)

The current at every point is half of the total current.

The current at every point is three times the total current.

The total current is equal to half the current at every point.

What is the total p.d. across the components in a series circuit equal to?

The difference of the individual p.d.s across each component.

Twice the sum of the individual p.d.s across each component.

The sum of the individual p.d.s across each component. (correct)

Half the sum of the individual p.d.s across each component.

What is true about the currents at a junction in a parallel circuit?

The sum of the currents entering a junction is greater than the sum of the currents leaving the junction.

The sum of the currents entering a junction is less than the sum of the currents leaving the junction.

The currents entering a junction are inversely proportional to the currents leaving the junction.

The sum of the currents entering a junction is equal to the sum of the currents leaving the junction. (correct)

What is the equation to calculate the combined resistance of two resistors in parallel?

1/R_total = 1/R1 + 1/R2 Signup and view all the answers

What is the function of a light-dependent resistor?

It decreases resistance in bright light. Signup and view all the answers

What is the equation for two resistors used as a potential divider?

V1/V2 = R1/R2 Signup and view all the answers

What is an NTC thermistor?

A resistor that decreases in resistance with temperature. Signup and view all the answers

What is the function of a variable potential divider?

It divides a voltage source into two or more parts. Signup and view all the answers

What is a key characteristic of a series circuit?

The total p.d. across the components is equal to the sum of the individual p.d.s across each component. Signup and view all the answers

What is the purpose of using an NTC thermistor in a circuit?

To act as an input sensor to detect changes in temperature Signup and view all the answers

What is the relationship between the current and voltage in a circuit with a variable potential divider?

The voltage is dependent on the ratio of the resistances Signup and view all the answers

What happens to the total resistance of a circuit when two resistors are connected in series?

The total resistance increases Signup and view all the answers

What is the function of a light-dependent resistor in a circuit?

To act as an input sensor to detect changes in light intensity Signup and view all the answers

What is the equation to calculate the combined resistance of two or more resistors in series?

R_total = R1 + R2 + ... + Rn Signup and view all the answers

What is the purpose of using a parallel circuit in a device?

To provide multiple paths for the current to flow Signup and view all the answers

What happens to the voltage across each component in a parallel circuit?

The voltage across each component is the same as the voltage of the main circuit Signup and view all the answers

Study Notes

Electric Circuits

In a series circuit, the current is the same at every point.
In a parallel circuit, the sum of currents entering a junction is equal to the sum of currents leaving the junction.
In a series circuit, the total p.d. across the components is equal to the sum of individual p.d.s across each component.
In a parallel circuit, the p.d. across an arrangement of parallel resistances is the same as the p.d. across one branch.

Calculations in Electric Circuits

The combined resistance of two or more resistors in series can be calculated.
The combined resistance of two resistors in parallel can be calculated.
Current, voltage, and resistance can be calculated in parts of a circuit or in the whole circuit.

Circuit Components

NTC thermistors have a negative temperature coefficient, meaning their resistance decreases with increasing temperature.
Light-dependent resistors change their resistance in response to changes in light intensity.
NTC thermistors and light-dependent resistors are used as input sensors.
A variable potential divider is a circuit component that produces a variable output voltage.
The equation for two resistors used as a potential divider is: V1 / V2 = R1 / R2.

Electric Circuits

In a series circuit, the current is the same at every point.
In a parallel circuit, the sum of currents entering a junction is equal to the sum of currents leaving the junction.
In a series circuit, the total p.d. across the components is equal to the sum of individual p.d.s across each component.
In a parallel circuit, the p.d. across an arrangement of parallel resistances is the same as the p.d. across one branch.

Calculations in Electric Circuits

The combined resistance of two or more resistors in series can be calculated.
The combined resistance of two resistors in parallel can be calculated.
Current, voltage, and resistance can be calculated in parts of a circuit or in the whole circuit.

Circuit Components

NTC thermistors have a negative temperature coefficient, meaning their resistance decreases with increasing temperature.
Light-dependent resistors change their resistance in response to changes in light intensity.
NTC thermistors and light-dependent resistors are used as input sensors.
A variable potential divider is a circuit component that produces a variable output voltage.
The equation for two resistors used as a potential divider is: V1 / V2 = R1 / R2.

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Description

Practice questions on Electric Circuits, focusing on series and parallel circuits, including calculations and current relationships. Based on the 2023-2025 Cambridge O Level Physics syllabus.