Electricity Flashcards
Total energy in =
Total energy out
What does electric potential measure?
The amount of energy per unit charge (eg bread per van)
What is electric potential measured in?
Volts
What is 1V equivalent to?
1 joule a coulomb
What does potential difference measure?
The difference between the amount of energy transferred per unit charge.
What is potential difference measured in?
Volts
A p.d of one volt is equivalent to,..
One coulomb of charge gaining or losing 1 joule of energy
When the length of the wire increases…
The resistance increases
The current decreases
What is charge measured in?
Coulombs
What does current measure?
The rate of the flow of charge
What is current measured in?
Amperes
What do you measure current with?
An ammeter
What do you measure electric potential with?
Voltmeter
What is one amp equivalent to?
One coulomb of charge passing through a point each second
Does current get used up?
No
Does charge get used up?
No
Does energy get used up?
Yes
When two insulators such as a Perspex and a duster a rubbed together what is transferred between them?
Electrons
If an object has an excess of electrons, what kind of charge will it have?
Negative
What piece of equipment can be used to measure the current in an electric circuit?
Ammeter
If I increase the number of cells in a battery, what will happen to the potential difference in a circuit?
Increases
If two similarly charged objects are brought together, what will happen to them?
Repels
When I add a second bulb into a circuit in series the brightness of both bulbs will decrease. One reason for this is that the energy carried by each charge is shared between two bulbs, what is the other reason?
Current decreases
When I touch the Van de Graaf generator my hair stands on end, what does this tell us about the hair?
All hairs have the same charge
A material that easily allows electric charge to flow through it is known as what?
Conductor
If I have two identical bulbs in parallel, if the potential difference across 1 bulb is 6V, what is the potential difference across the other bulb?
6V
I have a 10 ohm resistor in series with a 20 ohm resistor. The current through the 10 ohm resistor is 2A, what is the current through the 20ohm resistor?
2A
What equipment would I need in order to determine the resistance of a component in a circuit?
Voltmeter and Ammeter
If I have 3 batteries in series, each with a value of 1.5V, what will my potential difference be if I reverse the direction of one of the batteries?
1.5V
In the bakery model, what do the vans represent?
Charges (1 van = 1 coulomb of charge)
