S2 Electrical System Pop Flashcard

Front

What is a fuse?

Back

A fuse is a safety device that melts and breaks the circuit to protect appliances from excessive current.

Front

What happens in a parallel circuit?

Back

In a parallel circuit, the total resistance decreases as more branches are added, and the voltage across each component remains the same.

Front

How do you calculate total resistance in a parallel circuit?

Back

1/R1 + 1/R2 + 1/R3 = 1/RT, where RT is the total resistance.

Front

What is the function of a circuit breaker?

Back

A circuit breaker automatically interrupts the flow of electricity in a circuit when it detects an overload or short circuit.

Front

What is the power rating of an appliance?

Back

The power rating indicates the amount of electrical energy the appliance uses, measured in watts (W).

Front

How do you calculate energy consumption in kilowatt-hours (kWh)?

Back

Energy (kWh) = Power (kW) × Time (hours). For example, a 2.3 kW appliance used for 5 hours consumes 11.5 kWh.

Front

What is the cost of electricity if it is 20 cents per kWh?

Back

The cost of electricity is calculated by multiplying the energy consumed (in kWh) by the cost per kWh.

Front

What is the role of an earth wire?

Back

The earth wire provides a safe path for electric current to flow into the ground in case of a fault, preventing electric shock.

Front

What is a rheostat?

Back

A rheostat is a variable resistor used to control current flow in a circuit.

Front

What is the difference between series and parallel circuits?

Back

In a series circuit, components are connected end-to-end, and the current is the same through all components. In a parallel circuit, components are connected across the same voltage source, and the total current is the sum of the currents through each component.