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 pair of quantities contains one vector and one scalar quantity?

2013 Summer

2

MCQ

CH1 - PHYSICAL QUANTITIES & UNITS

One property Q of a material is used to describe the behaviour of sound waves in the material. Q is defined as the pressure P of the sound wave divide...

2013 Summer

2

MCQ

CH3 - KINEMATICS

A cannon fires a cannonball with an initial speed $v$ at an angle $\alpha$ to the horizontal. Which equation is correct for the maximum height $H$ re...

2013 Summer

3

MCQ

CH1 - PHYSICAL QUANTITIES & UNITS

A wave has a frequency of 5 GHz. What is the period of the wave?

2013 Summer

3

MCQ

CH2 - MEASUREMENT TECHNIQUES

In an experiment to determine the acceleration of free fall $g$, the period of oscillation $T$ and length $l$ of a simple pendulum were measured. The ...

2013 Summer

2

MCQ

CH2 - MEASUREMENT TECHNIQUES

The Y-input terminals of a cathode-ray oscilloscope (c.r.o.) are connected to a supply of amplitude 5.0 V and frequency 50 Hz. The time-base is set at...

2013 Summer

2

MCQ

CH3 - KINEMATICS

A body is released from rest and falls vertically in air of constant density. Which statement about the motion of the falling body is correct?

2013 Summer

2

MCQ

CH3 - KINEMATICS

A goods train passes through a station at a steady speed of 10 m s$^{-1}$. An express train is at rest at the station. The express train leaves the st...

2013 Summer

2

MCQ

CH3 - KINEMATICS

A car is stationary at traffic lights. When the traffic lights go green, the driver presses down sharply on the accelerator. The resultant horizontal ...

2013 Summer

2

MCQ

CH4 - DYNAMICS

Which of the following is a statement of the principle of conservation of momentum?

2013 Summer

2