Edexcel Physics 2 Topic 1
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What name is given to current that only flows in one direction?
Direct current (dc)
What sort of current is supplied by cells and batteries, a.c. or d.c.?
Direct current (d.c.)
What is the unit of electrical current?
Amperes (Amps) (A)
What is the unit of electrical charge?
How are insulators charged by friction?
Electrons are transferred from one insulator to the other, leaving one positively charged and one negatively charged
If electrons are transferred from an insulator, does it become positively or negatively charged?
positively (as they are negative and have left the insulator)
Do like charges attract or repel?
Name some uses for electrostatic charges
- Spraying aerosol paint
- Spraying crops with insecticides
- Removing dust and other particles from an air extractor
How does earthing prevent the build up of charges on an insulator?
It provides a low resistance path for the charge to flow.
Which particles are inside an atomic nucleus?
Which particles orbit the atomic nucleus?
What are the relative masses of
- Relative masses:
- electrons= 1/1800
What are the relative electric charges of
- Protons = +1
- neutrons = 0,
- electrons = -1
If an atom has 10 protons, how many electrons will it have?
10 (in an atom, the number of protons and electrons are equal)
What name is given to an atom which has gained or lost electrons?
Name some common electrostatic phenomena
- shocks from everyday objects
- charged balloon stuck to a wall
- charged comb picking up pieces of paper
How can we prevent electrostatic charge building up?
Use an earthing strip to discharge objects before charge builds up
Are electrons negatively or positively charged?
What causes some insulating materials to become electrically charged when they are rubbed together?
Electrons are rubbed off one material and onto the other
What happens when two electrically charged objects are brought together that have the same charge?
They repel each other
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