Topic 2 Resistance V = I x R Flashcards
What is the ammeter do
Measure the current on amps that flows through the wire
Where are ammeters placed
In series with what you are investigating
What does the voltmeter do
Measures the potential difference across the test wire in volts
Where is the volt meter placed
In parallel around what you are investigating
Drawn picture of circuit
On paper
Resistance practical
Attach crocodile clip with wire 0 cm on ruler
Attach second clip 10cm away
Close switch record current and pd
Repeat for different lengths
Calculate resistance for wire
Plot graph of resistance against wire length and draw a line of best fit
Find components of IV characteristics
Set up test circuit
Begin to vary variable resistor - alters the current flowing through the circuit and the pd across the component
Take several pairs of reading from ammeter and voltmeter to see how potential difference across components as current changes
Repeat to get average pd
Swap wires connected to battery to reverse direction of current
Plot graph of current against voltage for each component
Graph for resistance practical
On flash card
