CXC Integrated Science exam guide: Section B: Electricity

CXC Integrated Science exam guide: Electricity

CXC Integrated Science Exam Guide

Section B-The Home/Workplace

General objectives of the section:

Candidates should demonstrate an understanding of:


the soil and the sea as two most important outdoor working environments in the Caribbean and that they are both natural resources as well as ecosystems


the relationship between humans and the environment in which they work


the need for appropriate physical conditions such as ventilation and sanitation in the home and the workplace

the inter-conversion and conservation of the different forms of energy;

the occurrence of accidents and hazardous situations and safety measures used in their prevention.


Specific Objectives

Students should be able to:

Explanatory notes
Suggested Practical Activities

1. Discuss the use of good and poor  conductors of electricity;

Definition of conductors (good and poor). Use of rubber and plastics in covering electric wires and connections.

Simple experiments to detect good and poor conductors.

2. Explain the relationship between voltage, current and resistance in circuits;

Use of formula V=IR to find unknown units of electricity:  ampere, volt, watt, and ohm; mention symbols for ammeter,

Calculate wattage given voltage and current;

use ammeters and voltmeters to show how different resistance affect current;

set up circuits to show properties;

draw diagrams of series and parallel circuits.

3. Explain how a fuse works as a safety device;

Color code in wiring plug and choice of flex;

dangers of overloading circuit (overheating of wire that may cause insulation to burn).

Wiring of a plug.

4. Calculate the amperage for fuses and flexes needed for household appliances;

Use of formula I=W/V (watts divided by volts); consider use of thick wires as overhead cables and for heavy-duty appliances. Energy consumption = power x time.

Work out size of fuses for appliances.

5. Calculate the energy consumption of different electrical appliances;

The cost of using heating appliances (cloth iron, stoves) and non heating appliances ( radio, fluorescent bulbs, fans)

Measure energy consumption (units on meter) of different appliances.

6. Calculate electricity bills; Various costs which must be considered when making up electricity bills, including meter rentals and fuel adjustment charges; Unit-1kwh.

Read both digital and analogue meters.

If possible document electric supply from sources by switching off.

7. Describe the methods of extinguishing an electrical fire; Use non-electric fire extinguisher (Co2) or non-flammable material to smother fire.
8. Discuss energy conservation measures that can be taken in the use of electrical household appliances; Relationship between frequent and lengthy opening of refrigerator doors and increased consumption; energy wastage in faulty electrical appliances.
9. Discuss what energy transformation must take place to produce electricity; Make bells, bi-relays and electromagnets; demonstrate magnetic effect.
10. Discuss the magnetic effects of electrical current.


guest1 (not verified) 2 October 2009 - 12:18am

but what about us who are doing Human and Social biology? An exam guide would be nice for us too.

dekela (not verified) 6 May 2014 - 9:07am

where are the English B guides when you need them? My studying is going good so far, but i need to be secured about passing, so that's why i need a second guide.

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