WORK SHEET: 2
WORK SHEET: 2
1. A battery of negligible resistance is connected to a resistance of 20 Ω.
What must be the battery emf in order that current of 0.75 ampere may
flow through the circuit?
2. The resistance of the copper wire 200 m long is 21 Ω. If its thickness is
0.022 cm, calculate the specific resistance of copper.
3. The resistance of a platinum wire at 00C is 4 Ω. What will be the
resistance of the wire at 1000, if the temperature coefficient of platinum is
0.00380 C.
4. Calculate the equivalent resistance between resistances R1 =10 Ω and R2
= 5 Ω when connected series and parallel.
5. Three resistors of 5 Ω, 10 Ω and 20 Ω are
connected in series. Calculate the
effective resistance.
1. A battery of negligible resistance is connected to a resistance of 20 Ω.
What must be the battery emf in order that current of 0.75 ampere may
flow through the circuit?
2. The resistance of the copper wire 200 m long is 21 Ω. If its thickness is
0.022 cm, calculate the specific resistance of copper.
3. The resistance of a platinum wire at 00C is 4 Ω. What will be the
resistance of the wire at 1000, if the temperature coefficient of platinum is
0.00380 C.
4. Calculate the equivalent resistance between resistances R1 =10 Ω and R2
= 5 Ω when connected series and parallel.
5. Three resistors of 5 Ω, 10 Ω and 20 Ω are
connected in series. Calculate the
effective resistance.
6. Find the equivalent resistance across AB
(resistors of 5 Ω, 10 Ω, 15 Ω and 20 Ω)
from the given figure.
6. Find the equivalent resistance across AB
(resistors of 5 Ω, 10 Ω, 15 Ω and 20 Ω)
from the given figure.
7. An electrical iron is marked as 220 V 400 W. What is the current it takes
and what is hot resistance?
8. What is the resistance of 5000 watts and 250 V water heater? Assuming
the resistance to be unchanged, what would be the wattage if connected to
125 V supply?
7. An electrical iron is marked as 220 V 400 W. What is the current it takes
and what is hot resistance?
8. What is the resistance of 5000 watts and 250 V water heater? Assuming
the resistance to be unchanged, what would be the wattage if connected to
125 V supply?
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Dr Manjunatha S
WORK SHEET: 2
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WORK SHEET: 2
Dr Manjunatha S