Electricity

Question 0

Why do protons not move?

Answer 0

They are bound in the NUCLEUS.

Question 1

How do objects become charged?

Answer 1

When insulating materials are rubbed together, the ELECTRONS from one move onto the other so the second material is CHARGED NEGATIVELY and the first is CHARGED POSITIVELY.

Question 2

How does a photocopier work?

Answer 2

1. CHARGE - the drum is charged POSITIVELY.
2. PROJECT - an image is projected onto the drum and only the dark parts stay charged.
3. STICK - powdered ink sticks to charged parts of the drum.
4. TRANSFER - the ink powder is transferred to a piece of paper.
5. FIX - heated rollers melt the ink, helping it stick to the paper.

Question 3

Why is using a mobile while refuelling dangerous?

Answer 3

Air rushing past a car/plane can DRAG ELECTRONS off the vehicle’s body, leaving it charged POSITIVELY charged. This also causes the ground to become NEGATIVELY charged. Therefore, electrons may “LEAP” from the ground to the vehicle, causing a SPARK which can cause FUEL MOLECULES in the air to ignite. Sparks from mobile phones can cause the same effect.

Question 4

How does spray painting a car work?

Answer 4

The car is given a NEGATIVE charge, the paint a POSITIVE charge and therefore the paint sticks to the car because OPPOSITE charges ATTRACT. The paint spreads out evenly because of the fact that like charges REPEL.