Effects of Electric Current: Practice Questions Set 1

Effects of Electric Current: Practice Questions Set 1

1. Explain the relationship between electric current and heating. Provide an example.
Answer: When an electric current flows through a conductor, it produces heat due to the resistance offered by the conductor. This is known as the heating effect of electric current. For example, when you turn on an electric heater, the electric current passes through the heating element, which then generates heat.

2. How does electric current cause lighting? Explain with the help of a diagram.
Answer: Electric current can cause lighting through a process called incandescence. When a high amount of electric current flows through a filament, such as in an incandescent light bulb, the filament becomes extremely hot and emits light. Here is a diagram to help you visualize the process:

[Diagram]
Electric Current ---> Filament ---> Heat ---> Light

3. Describe the process of converting a conductor into a temporary magnet using electric current.
Answer: When an electric current passes through a conductor, it creates a magnetic field around the conductor. This phenomenon is known as the magnetic effect of electric current. To convert a conductor into a temporary magnet using electric current, we need to pass the current through a coil of wire wrapped around a magnetic material like iron. This creates a magnetic field, and the iron behaves like a magnet as long as the current flows through the coil.

4. Give an example of a device that converts a conductor into a heat emission device like a heater using electric current.
Answer: An electric iron is an example of a device that converts a conductor into a heat emission device using electric current. When you switch on the electric iron, the electric current passes through a coil inside, which gets heated up due to the resistance offered by the coil. The heat generated is then transferred to the iron's soleplate, allowing it to iron clothes effectively.

5. Discuss the safety precautions that should be followed while working with electric current. Give at least three examples.
Answer: It is crucial to follow safety precautions while working with electric current to avoid accidents or injuries. Here are three important safety precautions to keep in mind:

a. Always switch off the power supply before working on any electrical appliance or circuit. This helps prevent electric shocks.
b. Use insulated tools to handle electrical components to minimize the risk of electric shock.
c. Avoid working with wet hands or in wet conditions as water is a good conductor of electricity. This reduces the chances of electric shock.

Remember to prioritize safety at all times when dealing with electric current.

Great job answering these practice questions! If you have any doubts or need further clarification, feel free to ask.