Electricity

Question 1

Properties of magnets

Answer 1

It has two poles northern South Pole
It strength is concentrated at bowls
The law of magnet pole states that like balls rebuild an unlike balls attract each other
A free suspended magnet will face north south direction this means that the Earth has a bar magnet like properties which interact of our own magnets

Question 2

Uses of rheostat in our everyday life

Answer 2

1.to control pots in most guitars
2.to adjust volume off thermostat in heating system
3.to change volume in a radio
4.to adjust the brightness of bulbs

Question 3

Magnetism

Answer 3

Is a property of magnetic matter resulting in attractive and repulsive force

Question 4

Types of wires or conductor or material

Answer 4

Good conductors have low resistance poor conductors have high resistance

Question 5

The length of the wire or conductor

Answer 5

Resistance and the length of the wire are direct proportional the longer the wire the higher the resistance

Question 6

The thickness of the wire

Answer 6

Resistance and diameter of the wire are indirect proportional the thicker the wire the lower the resistance the thinner the wire the higher the resistance

Question 7

The temperature of the wire

Answer 7

Resistance and the temperature of the wire are direct proportional the higher the resistance

Question 8

Fuse

Answer 8

Is a device which melts because of too much effect of current in circuit when it breaks the circuit becomes incomplete

Question 9

Resistance of resistors connected in series

Answer 9

If you increase the number of resistors resistance will increase as well
The total resistance is equal to the sum of individual resistors

Question 10

total resistance for resistors connected in parallel

Answer 10

If resistors are connected in parallel the total resistors decreases
The voltage across the three resistors is the same but current in each branch depends on the resistance

Question 11

Static and electric current

Answer 11

Static electricity is a non moving of electrical charges

Question 12

Measuring current

Answer 12

Current is measured with ammeter and is always connected in series

Question 13

Circuit diagram

Answer 13

Circuit is a closed loop consisting of sources of energy and a bulb and more component where current flows

Question 14

Examples of static electricity

Answer 14

Lightning
Wearing a jersey