Question

Which is more likely to interfere with compass readings, AC current in your refrigerator or DC current when you start your car? Explain.

Short answer

The DC current will more likely interfere with compass readings.

Step-by-step solution

AC current and DC current

In alternating current, the flow of electric charges changes its direction periodically.

In direct current, the flow does not change periodically; electricity flows in a single direction in a steady voltage.

For household equipment, offices, and buildings, AC is the most often utilized and preferred electric power.

DC is mostly used to power electrical equipment as well as to charge batteries. Mobile phone batteries, torches, flat-screen televisions, and electric cars. These are just a few examples.

Explanation

1. As AC current constantly changes its direction numerous times each second; this implies magnetic field also changing. The induced forces, on the other hand, oscillate.

2. Here we can conclude this, while the compass needle receives a small push in one direction, it is soon pushed in the opposite direction by an equal quantity and magnitude.

3. This causes interference, but we normally don't perceive it since the frequency is so high.

4. On the other hand, DC current only flows in one direction, it creates a constant magnetic field, which also means constant magnetic force with enough time which causes more interference in a compass needle.

5. The disturbance due to DC current is noticeable.

Therefore, DC current will more likely interfere with compass readings.