Mine Flashcards
(21 cards)
Pd in parallel circuits are all the same voltage
Pd in parallel circuits
For components connected in parallel the pf across each compounds is the same
Work out the voltage
9-7=2
2 volts
What is a battery
Is two or more cells connected together
What happens if your add a battery to do this cell
It will be 2x9 =18
What will the pd be I. This cell
0 v
Why is this zero volts
The left cell is pointing at the current direction how every the right hand cell is pointing in the wrong direction this means the pd in the cell will cancel out
What is electrical charge measured in
Coulombs (c)
A current of 1 ampere =1 in electrical charge flowing per
coulomb of charge flowing per second
The size of electric current is the
rate of flow of electrical charge
How do you calculate a charge flow in a circuit
Q = I x t
Q = c charge flow
L (A) current
Time t s
Q = I x t
Q = 0.3 x 20s
= 6 C
How do u calculate the energy transferred
4 x 15
= 60 j
3 coulombs
30-25 =5
5X 3 =15
15 j
What dose the cell contain
Electrical energy which is transferred to electrical energy and is carried by the current
What is the current
The flow of electrons around a circuit
All the electrical energy carried by the current is transferred by the lamp into other forms of energy
And why dose this energy transfer take place what about components causing them to transfer energy = resistance
What is resistance
Is the flow of electrons through a conductor such as mental wire
As they move electrons ___with atoms in the metal electrical energy is transferred into other forms e,g thermal
Collide
How do you calculate resistance
R = v divided by I
V = pd
I = current A
