Resistors

Which copper wire has the lowest resistance?

• 1 meter of 1 mm diameter wire

• 0.5 meter of 1 mm diameter wire

• 0.5 meter of 0.5 mm diameter wire

• 1 meter of 0.5 mm diameter wire

What happens to a resistor when the temperature is increased?

• Increases

• decreases

• stay the same

• vary randomly

The length of a certain conductor of resistance 100 is doubled and its cross-sectional area is halved. Its new resistance is

• 100

• 50

• 200

• 400

Factor which does not affect the resistance

• Type of material

• Length of material

• Mass of the material

• Area of the material

The unit to measure the resistivity of a wire is

• ohms

• Volt

• ohms.m

• ohms.s

The type of current where charges flow in one direction

• Direct Current

• Alternating Current

• Electron Flow

• Voltage

The type of current where charges shake back and forth in a circuit

• Alternating Current

• Direct Current

• Voltage

• Switchback Current

24. A 20-m wire of 0.10 mm² cross-sectional area draws 0.5 A when connected across a 3.0-V potential difference.

(a) What is the resistance of the wire?

(b) What is the resistivity of the material from which the wire is made?

• (a) 1.5 Ω (b) 6.0 × 10^-9 Ω • m

• (a) 1.5 Ω (b) 3.0 × 10^-8 Ω • m

• (a) 6.0 Ω (b) 3.0 × 10^-8 Ω • m

• (a) 6.0 Ω (b) 6.0 × 10^-9 Ω • m

Where did the name "breadboard" come from?

• It is made of bread

• It is in the shape of a piece of bread

• They used to wire circuits on the board that was used to cut bread

• It sounded like a fun name.

what links the yellow holes together?

• connected metal clips

• nothing connects them

• none of these