emf and potential difference Flashcards
1
Q
What is the lines in a electric field called?
A
lines of electric flux
2
Q
What are the forms converted from energy?
A
- heat
- light
- kinetic energy (motion)
3
Q
What is electricity?
A
the movement of negative charged electrons moving
4
Q
How can electricity be moved?
A
by a source of electrical energy such as a battery or power supply that has a positive side and a negitive side
5
Q
what does this process provide EMF?
A
to drive around electrons in a circuit with the EMF
6
Q
What is the equation for EMF?
A
E = Q x EMF
7
Q
What does E stand for?
A
- energy in joules
- unit = J
8
Q
What does Q stand for?
A
- charge in coulombs
- unit = C
9
Q
What does EMF stand for?
A
- in volts (electromotive force)
- unit = V
10
Q
What are two types of cells?
A
- primary
- secondary
11
Q
What is a primary cell?
A
a cell that can only be used once
12
Q
What is a secondary cell?
A
a cell that can be used more than once (recharged)
13
Q
give examples of primary and secondary cell
A
- A primary cell, like a battery, is used for devices that will only run/work with primary cells. Which battery would gradually lose its charge
- A secondary cell, like a power bank, will be used to charge other devices like a phone. Though the cell will lose charge, it can also be recharged.
