Electric currents and its effects worksheet - Free Printable

Let's solve each question from the worksheet "Electric Current and its Effects" step by step, with explanations.

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Q1. _________ Fuse is mainly seen in electrical appliances.

Options:
a. Electric
b. Cartridge
c. Alloy
d. Steel

✔ Correct Answer: b. Cartridge

Explanation:
A cartridge fuse is a type of fuse commonly used in electrical appliances. It consists of a metal wire or strip enclosed in a protective casing (often glass or ceramic), which melts when excessive current flows through it, thereby breaking the circuit and protecting the appliance. While "electric" and "alloy" are related terms, "cartridge" is the correct term for the specific type of fuse used in household appliances.

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Q2. What is Resistance?

Options:
a. It is the amount of electricity the material can pass
b. The force that stops the flow of electricity
c. Both a and b
d. None of the above

✔ Correct Answer: d. None of the above

Explanation:
Resistance is the opposition to the flow of electric current in a conductor. It does not measure the amount of electricity passed (that’s more related to current or conductance). It also isn't exactly a "force" — rather, it's a property of the material that resists current flow. So neither option a nor b is fully accurate. Therefore, the best answer is d. None of the above.

> Note: A better definition would be: *"Resistance is the measure of how much a material opposes the flow of electric current."*

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Q3. What type of magnet is in an electric bell?

Options:
a. Normal
b. Temporary
c. Permanent
d. Electromagnet

✔ Correct Answer: d. Electromagnet

Explanation:
An electric bell uses an electromagnet, which is a magnet created by passing electric current through a coil of wire (usually wrapped around an iron core). When the current flows, the electromagnet becomes magnetic and pulls a hammer to strike the bell. When the circuit breaks, the magnetism disappears. This on-off behavior is essential for the bell's function.

So, it's not a permanent magnet but an electromagnet.

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Q4. ________ is a coiled wire which can be used to generate a magnetic field.

Options:
a. Electromagnet
b. Solenoid
c. Alloy
d. None of the above

✔ Correct Answer: b. Solenoid

Explanation:
A solenoid is a tightly wound helical coil of wire. When electric current passes through it, it produces a uniform magnetic field inside the coil, similar to a bar magnet. While an electromagnet often includes a solenoid (especially with an iron core), the term solenoid specifically refers to the coiled wire itself.

So, the most precise answer here is b. Solenoid.

> Note: An electromagnet may use a solenoid, but the question asks about a "coiled wire", so solenoid is the direct answer.

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Q5. The device for checking magnetic effect is ________

Options:
a. Computer
b. Compass
c. Insulator

✔ Correct Answer: b. Compass

Explanation:
A compass is a device that detects magnetic fields. It has a small magnetized needle that aligns itself with the Earth’s magnetic field. When placed near a current-carrying wire or magnet, the compass needle deflects, showing the presence of a magnetic field. Thus, it's widely used to detect and visualize magnetic effects.

- A computer is not used to check magnetic effects directly.
- An insulator blocks electric current and is not a detection tool.

So, the correct answer is b. Compass.

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✔ Final Answers:

| Question | Correct Answer |
|--------|----------------|
| Q1 | b. Cartridge |
| Q2 | d. None of the above |
| Q3 | d. Electromagnet |
| Q4 | b. Solenoid |
| Q5 | b. Compass |

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