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## Nabteb Basic Electricity Answer 2023

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BASIC ELECTRICITY

NUMBER ONE

(1ai)

A capacitor is a device that stores electrical energy in an electric field. It consists of two conductive plates separated by an insulating material called a dielectric.

(1aii)

An insulator is a material that does not conduct electric current easily meaning that it has high electrical resistance.

(1aiii)

A conductor is a material that allows electric current to flow through it easily meaning that it has low electrical resistance.

(1aiv)

Resistance is the opposition to the flow of electric current in a conductor. It is measured in ohms (Ω).

(1av)

Potential difference also known as voltage is the energy per unit charge required to move a charge from one point to another in an electric field.

(1bi)

Blue-grey-orange-silver resistor has a value of 68 kΩ ± 10%

Maximum value = (68 kΩ + 10% of 68 kΩ) = 74.8 kΩ

Minimum value = (68 kΩ – 10% of 68 kΩ) = 61.2 kΩ

(1bii)

Red-yellow-brown-gold resistor has a value of 240 Ω ± 5%

Maximum value = (240 Ω + 5% of 240 Ω) = 252 Ω

Minimum value = (240 Ω – 5% of 240 Ω) = 228 Ω

(1biii)

Brown-black-red-no band resistor has a value of 1 kΩ ± 2%

Maximum value = (1 kΩ + 2% of 1 kΩ) = 1.02 kΩ

Minimum value = (1 kΩ – 2% of 1 kΩ) = 0.98 kΩ

(1c)

Total emf = 1.5V + 2.0V + 3.5V = 7.0V.

Therefore the total emf of the three cells is *7.0V* .

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*BASIC ELECTRICITY*

*NUMBER TWO*

(2a)

Ohm’s Law states that the current passing through a conductor between two points is directly proportional to the voltage across the two points and inversely proportional to the resistance between them.

(2bi)

When the resistors are connected in parallel the equivalent resistance (Req) is =

1/Req = 1/2Ω + 1/3Ω + 1/4Ω + 1/6Ω

Req = 1.2Ω

Using Ohm’s Law =

I = V/Req = 12/1.2 = 10 A

Therefore the resultant current when the resistors are connected in parallel is 10 A.

(2bii)

When the resistors are connected in series the equivalent resistance (Req) is =

Req = 2Ω + 3Ω + 4Ω + 6Ω

Req = 15Ω

Using Ohm’s Law =

I = V/Req = 12/15 = 0.8 A

Therefore the resultant current when the resistors are connected in series is *0.8 A*

(2biii)

The current in the 4Ω resistor can be calculated by using Ohm’s Law in both cases =

(i) In parallel =

I = V/R = 12/4 = 3 A

Therefore the current in the 4Ω resistor when the resistors are connected in parallel is *3 A.*

(ii) In series:

I = V/R = 12/15 x 4 = 3.2 A

Therefore the current in the 4Ω resistor when the resistors are connected in series is *3.2 A.*

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*NABTEB BASIC ELECTRICITY*

*NUMBER FOUR*

(4ai)

(PICK ANY FOUR)

(i) Constant current charging

(ii) Constant voltage charging

(iii) Trickle charging

(iv) Fast charging

(v) Inductive charging

(vi) Solar charging.

(4aii)

(PICK ANY TWO)

(i) Ensure correct polarity while installing the cells in a device.

(ii) Keep the cells away from fire or any source of heat.

(iii) Do not mix different types of cells and batteries.

(iv) Use chargers designed for the specific type of cell or battery being charged.

(v) Avoid overcharging as it can cause the cell to explode or catch fire.

(vi) Store the cells in a cool and dry place.

(4bi)

The average value is calculated as:

= (2/π) × (peak value of the voltage)

= (2/π) × (200V)

= 127.32V

Therefore the average value of the alternating voltage is *127.32V*

(4bii)

The RMS value is calculated as:

RMS value = (peak value of the voltage) / √2

= 200V / √2

= 141.42V

Therefore the RMS value of the alternating voltage is *141.42V.*

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*NABTEB BASIC ELECTRICITY*

*NUMBER SIX*

(6a)

(PICK ANY THREE)

(i) eating effect: When current is passed through a resistor it produces heat. Example: An electric stove.

(ii) Magnetic effect: Electric current produces a magnetic field around it. Example: An electromagnet.

(iii) Chemical effect: Electric current can cause chemical reactions. Example: Electrolysis of water.

(iv) Illumination effect: Electric current produces light. Example: Incandescent light bulbs.

(v) Mechanical effect: Electric current produces mechanical motion. Example: Electric motors.

(vi) Shock effect: Electric current can cause shock or electrocution. Example: Touching a live wire.

(6b)

(PICK ANY SIX)

(i) Copper

(ii) Silver

(iii) Aluminum

(iv) Gold

(v) Iron

(vi) Brass

(vii) Bronze

(viii) Nickel

(6c)

(PICK ANY SIX)

(i) Rubber

(ii) Plastic

(iii) Glass

(iv) Air

(v) Porcelain

(vi) Dry wood

(vii) Bakelite

(viii) Ceramic

(6d)

1/R = 1/6 + 1/9 + 1/12 = 1/2

R = 2 ohms

I = V/R = 50/2 = *25 amperes*

Therefore the current in the circuit is *25 amperes.*

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