Theory

CH24 - ALTERNATING CURRENTS

A sinusoidal alternating voltage is to be rectified. (a) Suggest one advantage of full-wave rectification as compared with half-wave rectification.&n...

2009 Winter

Theory

CH24 - ALTERNATING CURRENTS

A student is asked to design a circuit by which a direct voltage of peak value 9.0V is obtained from a 240V alternating supply. The student uses a tra...

2010 Summer

Theory

CH24 - ALTERNATING CURRENTS

(a) Explain what is meant by the $\textit{root-mean-square}$ (r.m.s.) value of an alternating voltage.  [2] (b) An alternating voltage $V$ is re...

2010 Summer

Theory

CH24 - ALTERNATING CURRENTS

The variation with time $t$ of the current $I$ in a resistor is shown in Fig. 6.1. The variation of the current with time is sinusoidal. (a) Expla...

2010 Winter

Theory

CH24 - ALTERNATING CURRENTS

An alternating current supply is connected in series with a resistor R, as shown in Fig. 6.1. The variation with time $t$ (measured in seconds) of ...

2011 Summer

Theory

CH24 - ALTERNATING CURRENTS

An alternating current supply is connected in series with a resistor R, as shown in Fig. 6.1. The variation with time $t$ (measured in seconds) of ...

2011 Summer

Theory

CH24 - ALTERNATING CURRENTS

The variation with time $t$ of the output $V$ of an alternating voltage supply of frequency 50 Hz is shown in Fig. 6.1.(a) Use Fig. 6.1 to state (i) t...

2011 Winter

Theory

CH24 - ALTERNATING CURRENTS

The variation with time $t$ of the output $V$ of an alternating voltage supply of frequency 50 Hz is shown in Fig. 6.1. (a) Use Fig. 6.1 to state ...

2011 Winter

Theory

CH24 - ALTERNATING CURRENTS

The components for a bridge rectifier are shown in Fig. 5.1. (a) Complete the circuit of Fig. 5.1 by showing the connections of the supply and of t...

2011 Winter

Theory

CH24 - ALTERNATING CURRENTS

A sinusoidal alternating voltage supply is connected to a bridge rectifier consisting of four ideal diodes. The output of the rectifier is connected t...

2012 Summer

Theory

CH1 - PHYSICAL QUANTITIES & UNITS

(a) State what is meant by a $\text{scalar}$ quantity and by a $\text{vector}$ quantity. [2] (b) Complete Fig. 1.1 to indicate whether each of t...

2018 Summer

Theory

CH3 - KINEMATICS

(a) State what is meant by the mass of a body. [1] (b) Two blocks travel directly towards each other along a horizontal, frictionless surface. T...

2018 Summer

Theory

CH14 - WAVES

(a) For a progressive wave, state what is meant by (i) the period,   [1] (ii) the wavelength.   [1] (b) Fig. 4.1 shows the vari...

2018 Summer

Theory

CH14 - WAVES

(a) When monochromatic light is incident normally on a diffraction grating, the emergent light waves have been diffracted and are coherent. Explain w...

2018 Summer

Theory

CH19 - CURRENT OF ELECTRICITY

(a) Define the volt............................................................................................................... [1](b) A battery of...

2018 Summer

Theory

CH17 - ELECTRIC FIELDS

A $\beta^{-}$ particle from a radioactive source is travelling in a vacuum with kinetic energy 460 eV. The particle enters a uniform electric field at...

2018 Summer

Theory

CH1 - PHYSICAL QUANTITIES & UNITS

(a) Define force. .....................................................................................................................[1] (b) State...

2018 Summer

Theory

CH3 - KINEMATICS

(a) State the principle of conservation of momentum. [2] (b) A stationary firework explodes into three different fragments that move in a horizontal ...

2018 Summer

Theory

CH3 - KINEMATICS

A child on a sledge slides down a steep hill and then travels in a straight line up an ice-covered slope, as illustrated in Fig. 3.1. The sledge pa...

2018 Summer

Theory

CH14 - WAVES

(a) (i) Define the wavelength of a progressive wave.   [1] (ii) State what is meant by an antinode of a stationary wave.   [1] (...

2018 Summer