Theory

CH21 - ELECTRONICS

(a) By reference to an amplifier, explain what is meant by \textit{negative feedback}....................................................................

2009 Summer

Theory

CH21 - ELECTRONICS

An amplifier incorporating an operational amplifier (op-amp) has three inputs A, B and C, as shown in Fig. 9.1.Negative feedback is provided by the re...

2009 Winter

Theory

CH21 - ELECTRONICS

(a) (i) On Fig. 9.1, mark, with the letter X, the virtual earth. [1](ii) Explain what is meant by a virtual earth........................................

2010 Summer

Theory

CH21 - ELECTRONICS

(a) Negative feedback may be used in amplifier circuits. State(i) what is meant by negative feedback,....................................................

2010 Summer

Theory

CH21 - ELECTRONICS

(a) Negative feedback may be used in amplifier circuits. State(i) what is meant by \textit{negative feedback},...........................................

2010 Summer

Theory

CH21 - ELECTRONICS

An amplifier circuit incorporating an operational amplifier (op-amp) is shown in Fig. 9.1.Fig. 9.1(a) State(i) the name of this type of amplifier circ...

2010 Winter

Theory

CH21 - ELECTRONICS

An amplifier circuit incorporating an operational amplifier (op-amp) is shown in Fig. 9.1.[Image_1: Diagram showing an operational amplifier circuit]F...

2010 Winter

Theory

CH21 - ELECTRONICS

(a) State three properties of an ideal operational amplifier (op-amp).1. ................................................................................

2010 Winter

Theory

CH21 - ELECTRONICS

(a) An operational amplifier (op-amp) may be used as a comparator. State the function of a comparator....................................................

2011 Summer

Theory

CH21 - ELECTRONICS

(a) State two effects of negative feedback on the gain of an amplifier incorporating an operational amplifier (op-amp). 1. .............................

2011 Winter

MCQ

CH1 - PHYSICAL QUANTITIES & UNITS

The SI unit for potential difference (the volt) is given, in base units, by

2010 Summer

MCQ

CH1 - PHYSICAL QUANTITIES & UNITS

The product of pressure and volume has the same SI base units as

2010 Summer

MCQ

CH1 - PHYSICAL QUANTITIES & UNITS

An ion is accelerated by a series of electrodes in a vacuum. A graph of the power supplied to the ion is plotted against time.What is represented by t...

2010 Summer

MCQ

CH1 - PHYSICAL QUANTITIES & UNITS

A vector quantity $V$ is resolved into two perpendicular components $X$ and $Y$. The angle between $V$ and component $X$ is $\theta$. The angle betwee...

2010 Summer

MCQ

CH3 - KINEMATICS

The diagram shows a velocity-time graph for a vehicle. The vehicle, moving at 4.0 ms-1, begins to accelerate at time = 0. What is the vehicle's ac...

2010 Summer

MCQ

CH3 - KINEMATICS

A small steel ball falls freely under gravity after being released from rest. Which graph best represents the variation of the height $h$ of the ball...

2010 Summer

MCQ

CH4 - DYNAMICS

Two equal masses travel towards each other on a frictionless air track at speeds of $60 \text{ cm s}^{-1}$ and $40 \text{ cm s}^{-1}$. They stick toge...

2010 Summer

MCQ

CH4 - DYNAMICS

A brick weighing 20 N rests on an inclined plane. The weight of the brick has a component of 10 N parallel with the plane. The brick also experiences ...

2010 Summer

MCQ

CH4 - DYNAMICS

The diagram shows two identical spheres X and Y. Initially, X moves with speed v directly towards Y. Y is stationary. The spheres collide elastical...

2010 Summer

MCQ

CH5 - FORCES, DENSITY & PRESSURE

Forces of 3 N, 4 N and 5 N act at one point on an object. The angles at which the forces act can vary. What is the value of the minimum resultant for...

2010 Summer