Advertisements
Advertisements
प्रश्न
Name the material which is used for making the heating element of an electric iron.
Advertisements
उत्तर
The coils of the heating element of an electric iron is made of alloys like nichrome because alloys have a high resistance and a high melting point.
APPEARS IN
संबंधित प्रश्न
A battery of 9 V is connected in series with resistors of 0.2 Ω, 0.3 Ω, 0.4 Ω, 0.5 Ω and 12 Ω, respectively. How much current would flow through the 12 Ω resistor?
An electrical appliance has a resistance of 25 Ω. When this electrical appliance is connected to a 230 V supply line, the current passing through it will be:
(a) 0.92 A
(b) 2.9 A
(c) 9.2 A
(d) 92 A
When a 4 Ω resistor is connected across the terminals of a 12 V battery, the number of coulombs passing through the resistor per second is:
(a) 0.3
(b) 3
(c) 4
(d) 12
If the length of a wire is doubled by taking more of wire, what happens to its resistance?
Write down an expression for the resistance of a metallic wire in terms of the resistivity.
What is (a) highest, and (b)Ω lowest, resistance which can be obtained by combining four resistors having the following resistances?
4 Ω, 8 Ω, 12 Ω, 24 Ω
State how are the two resistors joined with a battery when equivalent resistance is more than either of the two resistances.
Calculate the equivalent resistance of the following combination of resistor r1, r2, r3, and r4
Choose the correct alternative and rewrite the following:
You are given three equal resistances. In how many combinations can they are arranged?
State the effect of rise in temperature on the resistance of semi-conductors.
Define the term resistivity and state its S.I. unit. Which will have higher resistivity a conductor or an insulator.
What is a resistance? Define it with respect to Ohm’s law,
You are provided with three resistors of resistance 1.0 Ω, 2.0 Ω and 3.0 Ω How would you connect them to obtain the total effective resistance 1.5 Ω? Draw diagram of the arrangement and check it by calculations.
Three resistors of 6Ω, 3Ω and 2Ω are connected together so that their total resistance is greater than 6Ω but less than 8Ω Draw a diagram to show this arrangement and calculate its total resistance.
Two resistors of 4Ω and 6Ω are connected in parallel to a cell to draw 0.5 A current from the cell.
Draw a labelled circuit diagram showing the above arrangement.
Two resistors of 4Ω and 6Ω are connected in parallel to a cell to draw 0.5 A current from the cell. Calculate the current in each resistor.
Calculate the value of the resistance which must be connected to a 15 ohm resistance to provide on effective resistance of 6 ohm.
Two wires of same material and same lengths have radii in the ratio of 2 : 3, Compare their resistances.
