Edexcel a level physics electric circuits

Question 1

What is the unit of electric current?

Answer 1

Ampere (A)

Question 2

True or False: Voltage is the measure of electric current.

Answer 2

False

Question 3

What is the formula for Ohm’s Law?

Answer 3

V = I × R

Question 4

Fill in the blank: The total resistance in a series circuit is equal to the _____ of individual resistances.

Answer 4

sum

Question 5

In a parallel circuit, the voltage across each component is _____ the same.

Answer 5

always

Question 6

What is the unit of resistance?

Answer 6

Ohm (Ω)

Question 7

What does a voltmeter measure?

Answer 7

Voltage (potential difference)

Question 8

True or False: In a series circuit, if one component fails, the entire circuit stops working.

Answer 8

True

Question 9

What is the equivalent resistance of two resistors, R1 and R2, in series?

Answer 9

R_total = R1 + R2

Question 10

What is the equivalent resistance of two resistors, R1 and R2, in parallel?

Answer 10

1/R_total = 1/R1 + 1/R2

Question 11

What is the formula for electric power?

Answer 11

P = V × I

Question 12

Fill in the blank: The total current in a parallel circuit is the _____ of the currents through each branch.

Answer 12

sum

Question 13

What does a ammeter measure?

Answer 13

Current (in Amperes)

Question 14

True or False: The total voltage in a series circuit is the sum of the voltages across each component.

Answer 14

True

Question 15

What is Kirchhoff’s Voltage Law?

Answer 15

The sum of the electrical potential differences (voltage) around any closed network is zero.

Question 16

What is Kirchhoff’s Current Law?

Answer 16

The total current entering a junction equals the total current leaving the junction.

Question 17

What is a short circuit?

Answer 17

A low-resistance connection between two points in a circuit, allowing excessive current flow.

Question 18

Fill in the blank: The power dissipated by a resistor can also be calculated using the formula P = _____ / R.

Answer 18

V^2

Question 19

What is the function of a fuse in an electric circuit?

Answer 19

To protect the circuit by breaking the connection if the current exceeds a certain level.

Question 20

What does a capacitor store?

Answer 20

Electric charge

Question 21

True or False: Capacitors in series have the same charge.

Answer 21

True

Question 22

What is the time constant of an RC circuit?

Answer 22

τ = R × C

Question 23

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

Answer 23

The total resistance decreases.

Question 24

What is an ideal battery?

Answer 24

A device that provides a constant voltage regardless of the current drawn.

Question 25

Fill in the blank: In a circuit, the _____ is the path through which electric current flows.

Answer 25

conductor

Question 26

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

Answer 26

Ohm's Law

Question 27

True or False: The higher the resistance, the lower the current for a given voltage.

Answer 27

True

Question 28

What is the effect of temperature on the resistance of a conductor?

Answer 28

Resistance typically increases with temperature.

Question 29

What does the term 'electrical energy' refer to?

Answer 29

The energy caused by moving electric charges.

Question 30

What is the formula for calculating energy consumed in a circuit?

Answer 30

E = P × t

Question 31

What is a resistor's color code used for?

Answer 31

To indicate its resistance value.

Question 32

Fill in the blank: The electric field strength (E) is defined as the force (F) per unit _____ (q).

Answer 32

charge

Question 33

What are the two main types of circuits?

Answer 33

Series and parallel circuits.

Question 34

What does the term 'load' refer to in a circuit?

Answer 34

The component that consumes electrical power.

Question 35

What is the primary purpose of a circuit breaker?

Answer 35

To automatically interrupt the flow of current in case of overload.

Question 36

True or False: In a parallel circuit, if one branch is disconnected, the other branches continue to function.

Answer 36

True

Question 37

What is the formula for calculating the equivalent capacitance (C_total) of capacitors in series?

Answer 37

1/C_total = 1/C1 + 1/C2

Question 38

What is the effect of connecting capacitors in parallel?

Answer 38

The total capacitance increases.

Question 39

Fill in the blank: The unit of capacitance is the _____ (F).

Answer 39

Farad

Question 40

What does the term 'electromotive force' (emf) refer to?

Answer 40

The voltage generated by a battery or other source.

Question 41

What happens during the discharge of a capacitor?

Answer 41

The stored energy is released into the circuit.

Question 42

What is the primary function of a diode in a circuit?

Answer 42

To allow current to flow in one direction only.

Question 43

True or False: A light bulb is an example of a resistive load.

Answer 43

True

Question 44

What is the significance of the 'breakdown voltage' in diodes?

Answer 44

The voltage at which a diode begins to conduct in reverse direction.

Question 45

Fill in the blank: The power factor in AC circuits is defined as the ratio of _____ power to apparent power.

Answer 45

real