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Q1— Section header —
1.1.5
1.2.5atomic number electromotive force /EMF doubled (two times\ electrical charges/electrostatic forces free electron
1.3
1.4The resistance of insulating materials decrease s as the temperature increases. (2\ [15]15
Q2— Section header —
2.1Magnetomotive force is the strength of a mag netic field in a coil of wire. (2\
2.3Lenz's law states that the direction of an induced emf is always such that it tend s to set up a current opposite the motion of flux responsible for inducing that emf. (2\
2.4The principle of electromagnetic induction states that when a conductor cuts magnetic flux, an emf is induced in the conductor. (2\
2.5.1
2.5.2
2.6When the switch is pressed, current passes through the coil and energises the electromagnet, resulting in the iron armature being attracted to the electromagnet. Attached to the armature is a striker which hits
2.7Place a woodscrew next to the conductor carrying the current. The direction in which the screw is turned is the same as the direction of flux, while the direction the screw travels through the wood represents the direction of the
Q3— Section header —
3.1.1
3.1.2
3.2The total resistance will increase and the total current will decrease The resistance in the parallel network increases, hence the total resistance increases and therefore the circuit current decreases.
3.3(2\
3.40,1 0,2 0,4
3.4=0,1+0,2+0,4 The total capacitance decreases when capacitors are connected in series (1\
3.5Cells are grouped in series, parallel and in series parallel. ny 2
3.6
3.7
3.8Line voltage refers to the amount of voltage measured between any two line conductors in a balanced three phase system.
3.830
Q4— Section header —
4.1The force produced by voltage or current causes the pointer of a deflecting device to move from position zero. (2\
4.2Low sensitivity Scale not uniform Costs re than moving iron instruments
4.3Connect the test leads into the sockets the black lead to the COM terminal. -e nergise the circuit completely. Remove the component to be measure d from the circuit if possible. Select the highest range on the ohm scale.
4.4.10, 0, =6
4.4.215
Q5— Section header —
5.1.1generator (1\
5.1.2It converts mechanical energy into electrical energy (2\
5.2In a wave winding, the two ends of each coil are connected to the commutator segments placed between adjacent poles of the same polarity or t he two ends of each coil a re bent in opposite directions.
5.3.1rame is the outer case or covering of machine protecting the inner parts thereof
5.3.2tator is the sta tionary part of machine creating a magnetic field. (1\
5.3.3The a rmature core houses the armature conductors and rotates in the magnetic field to make the conductors cut the magnetic flux. (2\
5.4.1Varied speed High s tarting torque (2\
5.4.2Elevators Conveyor belts (2\
5.5A self excited generator is a generator in which the field excitati on is provided by the armature. (2\
5.7[20] TOTAL:20