WAEC 2024 Basic Electricity Essay And Objective Questions And Answers
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WAEC 2024 Basic Electricity Objective Answers
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WAEC 2024 Basic Electricity Theory Answers
(2a)
RMS voltage:
Vrms = 120 / √2 = 120 / 1.414 = 84.84 V
(2b)
Frequency:
ω (angular frequency) = 314.2 rad/s
f (frequency) = ω / 2π = 314.2 / (2 × 3.14) = 50 Hz
(2c)
Average value:
The average value of a sine wave is 0, since it oscillates equally around 0.
(2d)
Instantaneous voltage at t = 2 ms:
Convert time to radians:
t = 2 ms = 2 × 10^(-3) s
ωt = 314.2 rad/s × 2 × 10^(-3) s = 0.6284 rad
the instantaneous voltage:
V = 120 sin(0.6284) = 120 × 0.5888 = 70.656 V
(3a)
-Measuring Resistance
-Continuity Testing
(3bi) the expected ammeter reading will be the same as the current through the load.
(3bii)
Total resistance = Resistance of load + Resistance of ammeter
Total resistance = 750 Ω + 750 Ω
Total resistance = 1500 Ω
Using Ohm’s Law,
Current (I) = Voltage (V) / Resistance (R)
Current (I) = 15 V / 1500 Ω
Current (I) = 0.01 A or 10 mA
the actual current in the circuit is 0.01 A or 10 mA.
(3biii)
Power (P) = Current (I) x Current (I) x Resistance (R)
=Power (P) = 0.01 A x 0.01 A x 750 Ω
Power (P) = 0.075 W or 75 mW
(5a)
[PICK ANY FOUR(4)]
(i)Transformers
(ii)Circuit breakers
(iii)Switches
(iv)Surge Arresters
(v)Instrument Transformers
(vi)Busbars
(vii)Voltage regulators
(5b)
[PICK ANY TWO(2)]
(i)Mechanical Transmission Systems
(ii)Hydraulic Transmission Systems
(iii)Electrical Transmission Systems
(iv)Pneumatic Transmission Systems
(v)Hydrostatic Transmission Systems
(5c)
Neural line (neutral) completes the electrical circuit and carries return current. WHILE,Earth line (grounding) ensures safety by providing a path to earth ground and preventing electrical shocks.
7(a)
[PICK ANY FOUR(4)]
(i) Safety
(ii)Voltage and current requirement
(iii)Load capacity
Installation type (residential, commercial, industrial)
(iv)Environmental conditions
(v)Cost
(vi)Ease of installation and maintenance
(vii)Flexibility and scalability
(viii)Compliance with regulations
(ix)Reliability and durability
(x)Energy efficiency
7(b)
[PICK ANY FOUR(4)]
(i)Pre-installation planning
(ii)Safety measures
(iii)Quality control
(iv)Material handling and storage
(v)Waste management
(vi)Environmental considerations
(vii)Communication and collaboration
(viii)Testing and commissioning
(ix)Documentation and record-keeping
(x)Post-installation evaluation
7(c)
[PICK ANY FOUR (4)]
(i)Switches (e.g., light switches, fan switches)
(ii)Sockets (e.g., power outlets, USB outlets)
(iii)Plug bases and plugs
(iv)Fuses and circuit breakers
(v)Fuse boxes and consumer units
(vi)Cable ties and cable clips
(vii)Electrical tape and wire nuts
(viii)Junction boxes and connector boxes
(ix)Ceiling roses and pendant switches
(x)Lamp holders and shades
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