A household uses an electric iron, a refrigerator, and an LED television simultaneously. What key factor must be considered to ensure safe operation without overloading the electrical circuit?
The total current drawn by all appliances must not exceed the circuit's rated capacity.
Household appliances are connected in parallel, so each one draws its own current \(I = \frac{P}{V}\) from the supply, and the current in the main line is the sum of all these currents.
When the electric iron, refrigerator and television run together, the total current rises. If it goes beyond the current rating of the wiring, fuse or MCB, the circuit is overloaded: the wires overheat and can cause a fire. So the deciding factor is keeping the total current within the rated capacity of the circuit.
The wire thickness is fixed when the wiring is installed and is not changed for every new appliance. The order of switching on does not change the total current once all appliances are running. In a parallel household circuit every appliance already receives the same supply voltage, so that is not the deciding factor for overloading.
Hence, The total current drawn by all appliances must not exceed the circuit's rated capacity.
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Important Questions from Current Electricity
- In a parallel combination of resistors, which of the following quantities remains the same across all the resistors?
- Which of the following statements is/are true for a domestic circuit?
(i) All the appliances are connected in parallel.
(ii) The live wire in the domestic circuit has green insulation on it.
(iii) A fuse connected to the circuit allows excessive current to pass through the appliances.
(iv) The neutral wire in the domestic circuits has black insulation on it. A science teacher asks students to measure the current through a bulb using an ammeter. What precaution must the students follow?
- Which characteristic of parallel circuits makes them advantageous over series circuits for connecting multiple electrical gadgets in a house?
- In a domestic electric circuit, the main purpose of a FUSE is ________.
