Provide answers to the case study below:
In domestic electrical wiring, the wire with red insulation is known as the live wire, while the black insulated wire is called the neutral wire. The earth wire, covered with green insulation, is connected to a metal plate buried deep in the ground near appliances with metal bodies. Overloading occurs when the current in a circuit suddenly increases beyond the safe limit, which may damage appliances. Protective devices help prevent such damage.
1. When is an electrical appliance considered overloaded?
2. What is the role of the earth wire in a domestic circuit?
3. How is an electric fuse connected in household wiring?
4. Under what conditions do overloading and short circuiting occur?
1. When is an electrical appliance considered overloaded?
2. What is the role of the earth wire in a domestic circuit?
3. How is an electric fuse connected in household wiring?
4. Under what conditions do overloading and short circuiting occur?
1.
An electrical device is regarded as overloaded
when it draws than it is designed to handle. This often happens when too many appliances are connected to the , or a single appliance is used beyond its power rating, which the appliances.
2. The earth wire provides a path for current to flow to the ground in case of a fault. If an appliance's metallic casing becomes due to a short circuit, the earth wire safely conducts the to the ground, preventing electric shock.
3. An electric fuse is connected in with the live wire of a domestic circuit. A fuse acts as a safety device protecting electrical appliances from short circuiting.
4. Overloading occurs when too many appliances draw than the circuit can safely handle. A short circuit occurs when a neutral wire comes into direct contact with a , causing a sudden surge of current.