## Resistance Required Practical Quiz

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Answer the questions below.
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1. What is the equation to measure resistance?
R = V/I
R = V x I
R = I/V

2. What is the unit of measurement for resistance?
Volt
Coulomb
Ohm

3. If you add more resistors what should you consider?
They should all be different resistance
They should all the be same resistance
It does not matter if they are the same or different

4. How is the ammeter placed in the circuit?
In Series
In Parallel
There is no need to use an ammeter

5. How is potential difference measured?
A voltmeter in parallel across the resistors
An ammeter in parallel across the resistors
A voltmeter in series either side of the resistors

6. If the results are plotted on a graph with number of resistors on x axis and resistance on y axis what would the shape of the graph be?
Negative correlation
Positive correlation
No correlation

7. How does length of wire in a circuit change resistance?
The longer the wire the lower the resistance
No change to resistance regardless of length
The shorter the wire the lower the resistance

8. How does thickness of wire in a circuit affect resistance?
No change to resistance regardless of thickness
Thicker wires have less resistance
Thinner wires have less resistance

9. How is resistance affected in a parallel circuit by adding more resistors?
When you add resistors the total resistance in the circuit decreases
When you add resistors the total resistance in the circuit increases
The change in resistance is directly proportional to the number of resistors

10. To achieve constant resistance what needs also to be constant?
Charge
Temperature
Time