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

A student creates a table to show reasonable estimates of some physical quantities. Which row is not a reasonable estimate? [Table_1]

2017 Summer

2

MCQ

CH3 - KINEMATICS

A particle travels in a straight line with speed $v$. The particle slows down and changes direction. The new speed of the particle is $\frac{v}{2}$. ...

2017 Summer

3

MCQ

CH1 - PHYSICAL QUANTITIES & UNITS

The speed $v$ of a liquid leaving a tube depends on the change in pressure $\Delta P$ and the density $\rho$ of the liquid. The speed is given by the ...

2017 Summer

1

MCQ

CH3 - KINEMATICS

The values of displacement, velocity and acceleration of a vehicle can be deduced from graphs representing its motion. Often the areas under these gra...

2017 Summer

3

MCQ

CH4 - DYNAMICS

A ball is released from rest above a hard, horizontal surface. The graph shows how the velocity of the bouncing ball varies with time. At which point...

2017 Summer

3

MCQ

CH3 - KINEMATICS

A ball is kicked upwards at an angle of 45° to horizontal ground. After a short flight, the ball returns to the ground. It may be assumed that ai...

2017 Summer

1

MCQ

CH4 - DYNAMICS

The mass of a rocket-propelled truck is approximately equal to the mass of the fuel in its tank. The fuel is ignited and the truck is propelled along ...

2017 Summer

2

MCQ

CH3 - KINEMATICS

An object is dropped at time $t = 0$ from a high building. Air resistance is significant. Three graphs are plotted against time. The height of the...

2017 Summer

3

MCQ

CH2 - MEASUREMENT TECHNIQUES

A student attempts to find the density $\rho$ of aluminium by taking measurements of a rectangular sheet. mass $m = 51.6 \pm 0.1$ g length $l = 100.0 ...

2017 Summer

2

MCQ

CH4 - DYNAMICS

The graph shows how the momentum of a motorcycle changes with time. What is the resultant force on the motorcycle? 

2017 Summer

2