Topic 3 - Electricity (Physics A level Edexcel)

What is Resistivity?

• the measurement of resistance in a circuit

• the properties of a circuit that meaures how strongly it resists current

• the properties of a wire that meaures how strongly it resists current

• the physical properties of a wire that create potential difference

The component follows ____ law

What is this component likely to be?

A component that follows Ohm's law...

• Has an exponential resistance curve

• Has the same current in as out

• Has a straight I vs V graph

• Has a constant resistance at any changing temperature

What component has this I vs V graph?

A filament bulb follows Ohm's Law

• True

• False

What component is this?

What is a potential divider?

• a circuit used to produce P.D

• a circuit used to produce EMF

• a circuit used to split P.D

• a circuit used to split EMF

What is Kirchoff's 1st law?

• Current into a junction is equal to current out in one wire

• Current into a junction is equal to sum of the currents out

• i1 = i2 + i3 + ...

• 1/it = 1/i1 + 1/i2 + ...

What is Kirchoff's second law?

• i1 = i2 + i3

• The P.d into the circuit must be equal to the sum of the P.d across the components in the circuit

• The current into the circuit must be equal to the sum of the current across the components in the circuit

• 1/Rt = 1/R1 + 1/R2 + ....