Science Form 2 Chapter 7- Electricity and Magnesium

Example of a few daily activities that use energy:

(Choose more than 1 answer)

• People use energy to run

• Plants need energy from the Sun to continue living

• Car need energy from fuel to move

• The light from the bulb is produced by energy

When two objects of different materials are rubbed together, the electrons are transferred from one object to the other.

The object that gains electrons will be......

• negatively charged

• positively charged

When two objects of different materials are rubbed together, the electrons are transferred from one object to the other.

The object that loses electrons will be.....

• negatively charged

• positively charged

What's electrostatic forces

• The attraction and repulsion between the electric charges

• The object that has equal number of protons and electrons

• an electric discharge.

• deviced use to detect the existence of electric charges on an object

What's  neutral

• The object that has different number of protons and electrons

• The object that has equal number of protons and electrons

• an electric discharge.

• deviced use to detect the existence of electric charges on an object

What's Electroscope

• The object that has different number of protons and electrons

• The object that has equal number of protons and electrons

• an electric discharge.

• a deviced use to detect the existence of electric charges on an object

What's lightning?

• Happens as a result of the transfer of electric charges between our body and the door knob that has static electric charges

• The object that has equal number of protons and electrons

• An electric discharge.

• A deviced use to detect the existence of electric charges on an object

There are two types of electrical charges

• positive charges

•     negative charges

• top charges

• bottom charges

Energy cannot be created nor destroyed but it can exist in various forms

(Is this correct?)

• Correct

• Wrong

S.I unit for energy

• joule (J)

• square metre(m²)

• henry(H)

• degree Celsius (°C)