2019 NABTEB GCE Basic Electricity Questions and Answers

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NABTEB GCE Basic Electricity Questions and Answers

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👑 2019 NABTEB GCE BASIC ELECTRICITY ANSWERS👑

100% VERIFIED BASIC ELETRICITY OBJ ANSWERS

1-10: CBDDCBACAD
11-20: DBBBDDDBDB
21-30: ACDCDCBACA
31-40: ABBABBCDBA

100% VERIFIED BASIC ELECTRICITY THEORY ANSWERS

(1ai)
A conductor is a material that allows the flow of charge or electrons (electrical current) in one or more directions. Examples: Graphite, Copper, Iron.

(1aii)
Insulators are materials that hinder the free flow of electrons from one particle of the element to another. Examples: Plastic, Wood, Glass

(1bi)
Power is the rate at which work is done (or energy is transferred). The S.I Unit of power is Watt.

(1bii)
Energy is the quantitative property that must be transferred to an object in order to perform work on, or to heat, the object. The SI unit‎ of energy is ‎Joule.

(1biii)
Matter is any substance that has mass and occupies space by having volume. Unit is mole
==============================

(2a)
Capacitance of a capacitor is defined as the ratio of the charge stored on any of the plates of capacitor to the potential difference between the plates.

(2b)
(i) The distance apart of the plate
(ii) The nature of the insulating material or dielectric between them
(iii) Area of the plates

(2ci)
Total capacitance of the parallel group
CT = C1 + C2 + C3
CT = 3 + 6 + 8
CT = 17Nf or 17 x 10^-6

(2cii)
Total capacitance of the circuit
1/CT = 1/(C1 + C2 + C3) + 1/C4
1/CT = 1/17 + 1/10
1/CT = 10+17/170
1/CT = 27/170
1/CT = 27/170
27CT = 170
CT = 170/27
CT = 6.296Nf or 6.296×10^-6f

(2ciii)
Charge stored in the capacitor of 50v
v = 50v
C = 6.296Nf
Q = CV
Q = 6.296×10^-6 x 50
Q = 314.8 x 10² x 10^-6
Q = 3.148×10-⁴C
==============================

(4ai)
Frequency of an alternating current is the number of cycles per second in an alternating current sine wave. It is measured in hertz (Hz)

(4aii)
The nstantaneous value of an alternating current is the value of current at one particular instant. The value may be zero if the particular instant is the time in the cycle at which the polarity of the current is changing

(4aiii)
Average value of alternating current is that value of steady current which sends the same amount of charge through a circuit in a certain time interval as is sent by an alternating current through the same circuit in the same time interval.

(4b)
Frequency, f = 1/T
T = period = 20mS = 20 x 10^-3 S

.:. f = 1/20 x 10^-3
= 10^3/20
= 1000/20
= 50Hz
==============================

(5a)
[Pick Any TWO]
(i) The room must be well-ventilated
(ii) Keep metal tools and jewelry away from batteries
(iii) Keep a neutralizing solution close by.
(iv) Eliminate sources of sparks or flames

(5b)
(i) Constant voltage charging
(ii) Constant current charging
(iii) Mixed constant current/constant voltage (CC/CV) charging
(iv) Pulse charging

(5c)
PRIMARY CELL:
(i) Non rechargeable
(ii) They have high internal resistance.
(iii) They are cheap

SECONDARY CELL:
(i) They can be recharged
(ii) They have low internal resistance.
(iii) They are expensive

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