Electricity Resistance Voltage
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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 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
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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 ...
Purchase this Solution
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