Potential difference is the work done per unit charge

2 of 26

Define Resistance

Resistance is defined as voltage/current

3 of 26

State Ohm's Law

Ohm's law is a case where current is directly proportional to voltage

4 of 26

Give the formula for Resistivity

Resistivity=(Resistance X Area) / Length

5 of 26

Give the formula for Resistance in terms of Resistivity

Resistance=(Resistivity X Length) / Area

6 of 26

Describe the effect of temperature on the resistance of metal conductors

Increasing the temperature, increases the amount of kinetic energy within the metal. This means electrons have to flow through a more turbulent mass of atoms, causing more collisions. Increasing the resistance.

7 of 26

Describe the effect of temperature on the resistance of thermistors.

Increasing the temperature means more electrons can break free of their atoms to become conduction electrons, which carry charge. This means there is more current flowing, decreasing the resistance.

8 of 26

Name an application of thermistors

Thermistors can be used as thermostats to monitor and control the temperature in rooms, fridges and incubators.

9 of 26

Define superconductivity

A property of certain materials which have zero resistivity at a critical temperature

10 of 26

Name an application of superconductors

Superconductors are used when strong electromagnets are required or to reduce energy loss in transmission of electric power.

11 of 26

How do you calculate resistance in a series circuit?

Rt = R1+R2

12 of 26

How do you calculate resistance in a parallel circuit?

1/Rt = 1/R1+1/R2

13 of 26

How do you calculate current in a parallel circuit?

Add

14 of 26

How do you calculate current in a series circuit?

Same

15 of 26

How do you calculate voltage in a parallel circuit?

Same

16 of 26

How do you calculate voltage in a series circuit?

Add

17 of 26

Give the formula which links Energy and Current

E=IVt

18 of 26

Give the formula which links Power and Current

P=IV

19 of 26

Give the formula which links Power and Current^2

P=I^2 R

20 of 26

Give the formula which links Power and Voltage^2

P=V^2/R

21 of 26

State Kirchoff's First Law

the total charge flowing into a junction of wires must equal the total charge flowing out of the junction

22 of 26

State Kirchoff's Second Law

the sum of the Emf’s in any closed loop in a circuit must be equal to the sum of the potential differences in the closed loop of a circuit

23 of 26

State the formula which links emf and charge

EMF = E/Q

24 of 26

State the formula which links emf and current

EMF = I(R+r)

25 of 26

Define electromotive force

Electromotive force is the energy provided by a cell per coulomb of charge passing through.

26 of 26

Other cards in this set

Card 2

Front

Define Potential Difference

Back

Potential difference is the work done per unit charge

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