# Electricity Resistance Voltage

1.

A wire 1 mm in diameter is connected to one end of a wire of the same material 2 mm in diameter of twice the length. A voltage source is connected to the wires and a current is passed through the wires. If it takes time T for the average conduction electron to traverse the 1-mm wire, how long does it take for such an electron to traverse the 2-mm wire?

Possible answers T/4 , T , 4T , 8T

2.

A wire has resistance R. A second wire has twice the length, twice the diameter, and twice the resistivity of the first wire. What is its resistance?

Possible answers 8R , R, R/4 , Resistance not given

3.

Resistor A has twice the resistance of resistor B. When individually connected across a given potential difference, which one dissipates the most power; and when connected in series across the same potential difference, which one dissipates the most power?

Possible answers A,A , A,B , B,B , B,A

4.

If a light bulb has half the resistance of a 100-W lightbulb, what would be its wattage? Assume both bulbs are attached to the same 120-V circuit.

Possible answers 200W , 50W , 25W , More information required

5.

When the voltage across a nonohmic resistor is doubled, the current through it triples. What happens to the power delivered to this resistor?

Possible answers This cannot be answered with the information given ,

Power decreases to 2/3 original amount , Power increases 1.5 times the original amount , The power increases to 6 times the original amount

https://brainmass.com/physics/power/electricity-resistance-voltage-301798

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1.

A wire 1 mm in diameter is connected to one end of a wire of the same material 2 mm in diameter of twice the length. A voltage source is connected to the wires and a current is passed through the wires. If it takes time T for the average conduction electron to traverse the ...

#### Solution Summary

The expert examines the electricity resistance voltage.

Electricity: Current, Voltage and Resistance

Assign any numbers (with units) to two of them and find the missing third value.

For example, assign numbers to Voltage and Resistance and find Current.

Or assign numbers to Current and Resistance and find Voltage.

Name one famous scientist who contributed to the study of electricity.

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