The following are important questions related to electric currents for Class 7:

1. What is an electric current?
An electric current is the flow of electric charge through a conductor. It is caused by the movement of electrons, which are negatively charged particles, in a closed circuit.

2. What is a closed circuit?
A closed circuit is a complete path through which an electric current can flow. It consists of a source of electric power (such as a battery), conductive wires, and a load (such as a light bulb or a motor).

3. What is a conductor?
A conductor is a material that allows electric current to flow through it easily. Examples of conductors include metals like copper and aluminum.

4. What is an insulator?
An insulator is a material that does not allow electric current to flow through it easily. Examples of insulators include rubber, plastic, and wood.

5. What is a switch?
A switch is a device that can open or close a circuit. When the switch is closed, the circuit is complete and current can flow. When the switch is open, the circuit is broken and current cannot flow.

6. What is resistance?
Resistance is the opposition to the flow of electric current in a circuit. It is measured in units called ohms. Materials with high resistance, such as rubber, require more energy to allow current to flow compared to materials with low resistance, such as copper.

7. What is voltage?
Voltage is the electric potential difference between two points in a circuit. It is measured in units called volts. Voltage is what causes electric charges to flow from one point to another.

8. What is a series circuit?
A series circuit is a circuit in which the components (such as bulbs or resistors) are connected in a single path. The same current flows through each component in a series circuit.

9. What is a parallel circuit?
A parallel circuit is a circuit in which the components are connected in multiple paths. The voltage across each component in a parallel circuit is the same, but the current can vary.

10. What is a fuse?
A fuse is a safety device that protects an electrical circuit from excessive current. It contains a thin wire that melts when the current exceeds a certain limit, breaking the circuit and preventing damage to other components.

11. What is a circuit breaker?
A circuit breaker is another safety device that automatically breaks the circuit when the current exceeds a certain limit. Unlike a fuse, a circuit breaker can be reset after it trips.

12. What is an electric shock?
An electric shock occurs when a person comes into contact with a live wire or a faulty electrical appliance. It can result in injury or even death. It is important to be cautious and follow safety precautions when dealing with electricity.

13. How does an electric circuit work?
An electric circuit works by providing a closed path for the flow of electric current. The electric current is driven by a source of energy, such as a battery or a power plant. The current flows through the conductive wires and powers the load, such as a light bulb, by converting electrical energy into other forms of energy, such as light or heat.