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The diagrams below show a meter box and miniature circuit breakers - Leaving Cert Home Economics - Question 1(a) - 2014
Question 1(a)
The diagrams below show a meter box and miniature circuit breakers. (i) Explain how electricity enters the home. Include reference to the meter box and the miniatur... show full transcript
Worked Solution & Example Answer:The diagrams below show a meter box and miniature circuit breakers - Leaving Cert Home Economics - Question 1(a) - 2014
Step 1
Explain how electricity enters the home. Include reference to the meter box and the miniature circuit breakers.
Answer
Electricity enters the home through a utility supply line that connects to a sealed fuse box, which serves as the main entrance for electrical current. Inside the meter box, a meter records the overall consumption of electricity, providing data on the kilowatt-hour (kWh) usage. The current is then routed to the miniature circuit breakers (MCBs).
The MCBs protect the home's electrical system by automatically switching off the circuit in case of overload or fault conditions. If a fault occurs, the MCB will trip and cut the current flow to prevent damage or fire hazards. The issue can typically be resolved by resetting the MCB.
In summary, the system starts from the utility supply line to the meter box for recording usage, followed by the MCBs for circuit safety.
Step 2
In relation to electricity explain each of the following: fuse
Answer
A fuse is a safety device used in electrical appliances that protects against overcurrent situations by deliberately breaking the circuit when it detects excessive current flow. If too much current passes through it, the fuse element melts, interrupting the flow of electricity and thereby preventing potential damage to the appliance or electrical circuit.
Step 3
In relation to electricity explain each of the following: kilowatt per hour (kWh)
Answer
A kilowatt per hour (kWh) is a unit of energy equivalent to using one kilowatt of power for one hour. It quantifies electricity consumption; for instance, if an appliance rated at 1000 watts (1 kilowatt) operates for one hour, it consumes 1 kWh of electrical energy. This measurement is significant for billing purposes as it reflects the amount of electricity used in a household over time.
Step 4
In relation to electricity explain each of the following: voltage
Answer
Voltage is a measure of electrical pressure or potential difference in a circuit. It is the force that pushes electric charges through a conductor. In residential systems, the standard voltage supply in most countries (e.g., 230 volts in Ireland) determines how much energy appliances receive to operate effectively. Higher voltages imply greater energy transfer potential.
Step 5
Outline four guidelines for the safe use of electricity in the home.
Answer
- Never mix electricity with water; avoid using electrical appliances in damp areas such as bathrooms or near sinks.
- Use appropriate fuse ratings for electrical appliances to prevent overloads and potential fire hazards.
- Ensure that all electrical installations and repairs are carried out by qualified professionals.
- Always unplug appliances when not in use, and ensure that cords and plugs are in good condition to prevent electrical shocks or fires.