EASY
12th CBSE
IMPORTANT
Earn 100
The coil of a heater is cut into two equal halves and only one of them is used into heater. What is the ratio of the heat produced by this half coil to that by original coil?
Important Questions on Current Electricity
EASY
12th CBSE
IMPORTANT
What do you mean by the maximum power rating of a resistor ?
EASY
12th CBSE
IMPORTANT
Express power transferred per unit volume into joule heat in a resistor in terms of current density.
EASY
12th CBSE
IMPORTANT
Write two special characteristics of the wire of an electric heater.
EASY
12th CBSE
IMPORTANT
What are the characteristics of a fuse wire ?
EASY
12th CBSE
IMPORTANT
What is the difference between a heater wire and a fuse wire ?
EASY
12th CBSE
IMPORTANT
Two identical heaters rated are placed in series with each other across a line. What is their combined power ?
EASY
12th CBSE
IMPORTANT
Write an expression for the resistivity of a metallic conductor showing its variation over a limited range of temperature.
EASY
12th CBSE
IMPORTANT
The plot of the variation of potential difference across a combination of three identical cells in series, versus current is as shown in Figure.
What is the emf of each cell ?
