विद्युत धारा के प्रश्न

What is electricity, which is used in homes, schools, hospitals, and industries?

Answer explanation

Electricity is a form of energy resulting from the flow of electric charge. It powers devices and systems in homes, schools, hospitals, and industries, enabling lighting, heating, and operation of machinery.

How does electricity flow in a conductor?

Answer explanation

Electricity flows in a conductor due to the movement of free electrons. When a voltage is applied, these electrons gain energy and drift towards the positive terminal, creating an electric current.

What role do batteries play in a circuit?

Answer explanation

Batteries provide the necessary voltage and current to drive the flow of electrons in a circuit, acting as a power source that enables devices to operate.

What happens when the switch is turned on?

Answer explanation

When the switch is turned on, it completes the electrical circuit, allowing current to flow. This typically powers a device or light connected to the circuit, resulting in it operating or illuminating.

What does the switch do?

• Connects the circuit

• Disconnects the circuit

Answer explanation

The switch connects the circuit when it is in the 'on' position, allowing current to flow. This is why the correct answer is 'Connects the circuit', as it enables the operation of electrical devices.

What is the flow of electric current called?

• Electric flow

• Electric current

Answer explanation

The flow of electric current is specifically referred to as 'electric current'. This term describes the movement of electric charge, making it the correct choice over 'electric flow', which is not a standard term.

How is electric current represented?

• By the flow of electrons

• By the flow of protons

Answer explanation

Electric current is represented by the flow of electrons, which are negatively charged particles. Protons, being positively charged, do not move in the same way within a conductor, making electrons the primary carriers of current.

What happens when the circuit is broken?

• Current stops flowing

• Current continues to flow

Answer explanation

When the circuit is broken, the path for current flow is interrupted, causing the current to stop flowing. This is why the correct answer is that current stops flowing.

What is the direction of electric current?

• From positive to negative

• From negative to positive

Answer explanation

Electric current is defined as the flow of electric charge. By convention, it flows from the positive terminal to the negative terminal, making 'From positive to negative' the correct direction of electric current.

What is the SI unit of electric current?

• Coulomb

• Ampere

• Volt

• Ohm

Answer explanation

The SI unit of electric current is the Ampere, often abbreviated as 'A'. It measures the flow of electric charge, while Coulomb is a unit of charge, Volt is a unit of electric potential, and Ohm is a unit of resistance.