# 5.1.5 - 5.1.10 Electric Circuits

8 Questions | Total Attempts: 78  Settings  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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