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Three resistances one ohm, two ohm, and three ohm are combined in parallel combination then equivalent resistance
Emf and terminal potential are related as
The complex networks are analyzed by
A piece of copper and another of germanium are cooled from room temperature to 77K. The resistance of
The equivalent resistance between the points A and B in the following figure is:
A charge of 90C passes through a wire in 1 hour and 15 minutes. What is the current in the wire?
The resistances of 2 ohms and 4 ohms are connected in parallel, the equivalent resistance will be
Four wires of equal length and of resistance 10 W each are connected in the form of a square. The equivalent resistance between two opposite corners of the square is
A wire of uniform area of cross-section is cut into 2 halves; the resistance of each part is,
The diagram shows an arrangement of four resistors. The equivalent resistance between X and Y.
Figure Shows a battery of 12V and negligible internal resistance connected to three resistance. The potential difference across AB and the main current I are
Basically, a potentiometer is a device for
The relation for potentiometer is given
The resistance of a wire is 20 ohms. It is stretched so that the length becomes three times, then the new resistance of the wire will be
Ohm's law is true
A certain piece of silver of given mass is to be made like a wire. Which of the following combination of length (L) and the area of cross-section will lead to the smallest resistance?
Resistivity of a material depends upon
The current in the adjoining circuit will be
Two bulbs are working in parallel order. Bulb A is brighter than bulb B. If RA and RB are their resistance respectively then
The electrical resistance of metals
The effective resistance of two resistors in parallel is 12/7Ω. If one of the resistors is disconnected the resistance becomes 4 Ω. The resistance of the other resistor is
If the current through a resistance is halved, then the
Which of the following statements is not true?
Emf is most closely related to
Which expression is the best to compare the power dissipation in different resistors which are connected in parallel?
A cell has an emf of 1.5 V. When circuit is shorted, it gives a current of 3A. The internal resistance of the cell is
In the circuit shown below voltmeter measures 20V, then value of circuit voltage V is about __________ volt.
The SI unit of temperature coefficient of resistivity is.
When the temperature of conductor increase, its resistance
Two unequal resistances are connected in parallel. Which one of the statement is correct?
electrons pass across the section of a conductor in 1 minute 20 sec. The current flowing is
Three element having conductance G1 , G2 and G3 are connected in parallel. Their combined conductance will be
If a bulb has a 20W power. If it is working at 60% efficiency then its output power is
A resistance of 6 ohm is connected in series with another resistance of 4 ohm across a battery of 20V. the p.d. across the 6 ohm resistor is
For an open circuit
Five resistances are connected as shown in the figure. The effective resistance between the points A and B is
In the given current distribution, what is the value of I?
When a current flows in a wire, there exists an electric field, in the direction of
The resistance of semi-conductor ______ with increase in temperature
In the circuit shown, a potential difference of 3 V is applied across XY. What is the current through the 5 W resistor?
The resistance of a wire is doubled if
The substance having negative temperature co-efficient is:
One Ohm is equal to:
Heat generated by a 40 W bulb in one hour is:
A wire of resistance 4is bent in the form a circle. The resistance between the ends of any diameter is
Figure shows a network of resistances connected to a 2V battery. If the internal resistance of the battery is negligible, current I in the circuit is.
Three resistors of 2 ohm, 3 ohm and 5 ohm are connected in parallel across a battery of 10 V and of negligible internal resistance. The potential difference across the 3 ohm resistor is
The length of a wire gets doubled on applying a stress of 20 108 N/m2. The Young’s modulus of elasticity for the wire in N/m2, will be
The smallest resistance obtained by connecting 50 resistances of 1/4 ohm each is
What is the voltage across a 6 resistor when 3A of current passes through it?
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