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Electric Circuits
N identical capacitors are joined in parallel and the combination is charged to a potential V. Now if they are separated and then joined in series, will the energy of combination remain the same or will it increase? Explain why.
Electric Circuits
The temperature at which the tungsten filament of a 12 V and 36W lamp operates is
1730o
C. If the temperature coefficient of resistance of tungsten is
6×10−3
/K, find the resistance of the lamp at a room temperature of 20$^{o}$C
1730o
C. If the temperature coefficient of resistance of tungsten is
6×10−3
/K, find the resistance of the lamp at a room temperature of 20$^{o}$C
Electric Circuits
From a top view perspective, in what direction does the north pole of the compass needle point to when the compass uses positioned around the vertical current carrying straight conductor?
Electric Circuits
What is the power dissipated in a 5 W resistor if the current is 4 A?
and
What is the current through a 5 kW resistor when the power dissipated by the element is 20mW?
and
What is the current through a 5 kW resistor when the power dissipated by the element is 20mW?
Electric Circuits
A portable TV uses a 12V, 3A-h battery over a period of 5.5 hours when the battery is empty. What is the average current drawn during this period? What is energy expended by the battery during this period?
Electric Circuits
If a Kilowatt hour costs 25 cents, how much does it cost to light up a 20W low power light bulb continuously for 1 year?
Electric Circuits
- If the charge flowing is equal to 0.16C every 64ms, what is the current flow in Amperes? and
- How many seconds are required for 4x10^16 electrons to pass if current flow is 5mA?
- How many seconds are required for 4x10^16 electrons to pass if current flow is 5mA?
Electric Circuits
how the formula of resistance changes in different conditions like:
1 when mass, resistance,density of material of which wire is made and resistivity of the wire is given and we have to find diameter and length of the wire.
2 when length, diameter and resistance of wire is given and we have to find resistivity of the material of wire.
3 when resistance of wire is given and length is increased to twice its original length.and we have to calculate new resistance.
4 when a wire is stretched to reduce its diameter to half its original value and we have to find new resistance of wire.
5 when resistance of wire is given and the wire is stretched so that its length become s 3 times. assuming that there is no change in density on stretching and we have to calculate the resistance of new wire.
PLEASE ALSO GIVE REASON THAT HOW FORMULA CHANGE.
1 when mass, resistance,density of material of which wire is made and resistivity of the wire is given and we have to find diameter and length of the wire.
2 when length, diameter and resistance of wire is given and we have to find resistivity of the material of wire.
3 when resistance of wire is given and length is increased to twice its original length.and we have to calculate new resistance.
4 when a wire is stretched to reduce its diameter to half its original value and we have to find new resistance of wire.
5 when resistance of wire is given and the wire is stretched so that its length become s 3 times. assuming that there is no change in density on stretching and we have to calculate the resistance of new wire.
PLEASE ALSO GIVE REASON THAT HOW FORMULA CHANGE.
Electric Circuits
A wire of length 2.0 m, diameter 1.0 mm has 50 m ohm resistance. Calculate resistivity of the material of wire ?
Electric Circuits
125 drops of water having potential of each 100 V . find the potential of bigger drop.
