5.1.5 - 5.1.10 Electric Circuits
Resistance
- 1.What is the best definition of Resistance?
- A.
V/I
- B.
The ability to stop a flow of current
- C.
The impedence of the flow of current
- D.
The PD divided by current through a component
- 2.100mA is enough to kill a person. If a man's electrical resistance is around 1000 ohms when he gets out of the shower, what voltage would just be enough to kill him?
- A.
1V
- B.
10V
- C.
100V
- D.
240V
- 3.How would you double the resistance of a piece of wire?
- A.
Warm it up
- B.
Half its length
- C.
Double its width
- D.
Double its length
- E.
Double its length AND half its width
- 4.What is Ohm's Law?
- A.
V=IR, where V=Potential difference, I=current, R=resistance
- B.
R=V/I where V=Potential difference, I=current, R=resistance
- C.
Current is proportional to Potential difference
- D.
A resistor will have a constant resistance at a fixed temperature whatever the current.
- E.
A resistor has a constant resistance.
- 5.How would you describe the I/V graph of a filament lamp (I - y axis, V - x axis)?
- A.
Straight line graph through the origin
- B.
Straight line graph through the origin but starts to curve slightly up at end
- C.
Straight line graph through the origin but starts to curve slightly down at end
- D.
Straight line graph through the origin then horizontal line
- E.
Straight line graph through the origin then a vertical line
- 6.What is the power required by a 4amp 240 V applicance?
- A.
0.0166666 W
- B.
60W
- C.
960W
- D.
6KW
- 7.What does the resistivity of a resistor depend on?
- A.
Its length
- B.
Its width
- C.
Its length and its width
- D.
Its mass
- E.
The material it is made of
- 8.Are there any parts of this section - resistivity, resistance, ohms law, ohmic and non-ohmic resistors that you do not understand?
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