Theory

CH24 - ALTERNATING CURRENTS

(a) State what is meant by the frequency of an alternating current. ....................................................................................

2024 Winter

5

Theory

CH24 - ALTERNATING CURRENTS

A circuit contains a power supply that provides a sinusoidal alternating input voltage $V_{IN}$. There is an output voltage $V_{OUT}$ across a load re...

2024 Summer

7

Theory

CH24 - ALTERNATING CURRENTS

(a) State the purpose of the circuit in Fig. 7.1.........................................................................................................

2024 Summer

4

Theory

CH24 - ALTERNATING CURRENTS

A varying current $I$ passes through a resistor of resistance $R$ in the circuit shown in Fig. 7.1.Fig. 7.2 shows the variation with time $t$ of $I$.T...

2023 Winter

4

Theory

CH24 - ALTERNATING CURRENTS

Four diodes are used in a bridge rectifier circuit to produce rectification of a sinusoidal a.c. input voltage $V_{IN}$. Fig. 7.1 shows part of the ci...

2023 Summer

7

Theory

CH24 - ALTERNATING CURRENTS

An electron in a metal rod moves randomly about a mean position. When an alternating voltage is applied to the ends of the rod, the mean position can ...

2023 Winter

4

Theory

CH24 - ALTERNATING CURRENTS

A varying current $I$ passes through a resistor of resistance $R$ in the circuit shown in Fig. 7.1.[Image_1: Fig. 7.1]Fig. 7.2 shows the variation wit...

2023 Winter

3

Theory

CH24 - ALTERNATING CURRENTS

Fig. 5.1 shows four diodes and a load resistor of resistance 1.2 kΩ, connected in a circuit that is used to produce rectification of an alternating v...

2022 Summer

4

Theory

CH24 - ALTERNATING CURRENTS

(a) A sinusoidal alternating voltage has a root-mean-square (r.m.s.) potential difference (p.d.) of 4.2 V and a frequency of 50 kHz.(i) The alternatin...

2022 Winter

5

Theory

CH24 - ALTERNATING CURRENTS

Fig. 5.1 shows four diodes and a load resistor of resistance 1.2 kΩ, connected in a circuit that is used to produce rectification of an alternating v...

2022 Summer

5

MCQ

CH1 - PHYSICAL QUANTITIES & UNITS

Which quantity with its unit is correct?

2016 Summer

2

MCQ

CH1 - PHYSICAL QUANTITIES & UNITS

The luminosity $L$ of a star is given by $L = 4\pi r^2 \sigma T^4$ where $r$ is the radius of the star, $T$ is the temperature of the star, $\sig...

2016 Summer

3

MCQ

CH1 - PHYSICAL QUANTITIES & UNITS

The diagram shows two vectors X and Y, drawn to scale. If X = Y − Z, which diagram best represents the vector Z?

2016 Summer

3

MCQ

CH2 - MEASUREMENT TECHNIQUES

The diagram shows a cathode-ray oscilloscope (c.r.o.) being used to measure the rate of rotation of a flywheel.The flywheel has a small magnet M mount...

2016 Summer

2

MCQ

CH2 - MEASUREMENT TECHNIQUES

A student determines the density $\rho$ of steel by taking measurements from a steel wire. mass $m = 6.2 \pm 0.1 \text{ g}$ length $l = 25.0 \pm 0.1 \...

2016 Summer

3

MCQ

CH3 - KINEMATICS

The acceleration of free fall on the Moon is $1.6 \, \text{m}\,\text{s}^{-2}$. The Moon has no atmosphere. An astronaut standing on the surface of the...

2016 Summer

2

MCQ

CH3 - KINEMATICS

A tennis ball is released from rest at the top of a tall building. Which graph best represents the variation with time $t$ of the acceleration $a$ of ...

2016 Summer

3

MCQ

CH3 - KINEMATICS

The graph shows how the velocity $v$ of an object moving in a straight line varies with time $t$ from $t = 0$ to $t = T$. Which graph represents th...

2016 Summer

3

MCQ

CH4 - DYNAMICS

A ball falls vertically onto horizontal ground and rebounds, as shown. The ball has momentum $p_1$ downwards just before hitting the ground. After ...

2016 Summer

3

MCQ

CH4 - DYNAMICS

A sphere falls from rest through the air. The graph shows the variation with time of the sphere’s velocity. Which diagram shows the forces ac...

2016 Summer

3