current electricity

Created on By buzzerkings

Current Electricity

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If length of the wire becomes two time to the original value and area becomes one half to its original value, then resistance of the wire becomes:

2 / 72

 The power of an electric bulb is 100W. It is connected to 110V power is supply. The resistance of electric bulb will be?

3 / 72

The change in a résistance of metallic conductor below 0°C?

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One of the following is an ohmic device

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When a wire is compressed and its radius becomes 2R then its resistance will be:

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 One kilowatt-hour is commonly termed as one commercial unit of electric energy which is equal to 

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A car battery has EMF of 12 Volts and internal resistance 5x 10^-2 ohm. If it draws 60 ampere current, then terminal voltage of the battery will be

8 / 72

A copper wire has length 1, and cross-sectional area A. Its resistance is R. If we halved the length and halved the diameter of wire, then what will be the resistance of this wire?

9 / 72

Calculate the rate at which energy is transferred by 220 V mains supply which provides a current of 0.1 A to a LED?

10 / 72

A cell of internal resistance 2.0Ω and electromotive force (e.m.) 1.5V is connected to a resistor of resistance 3.0Ω what is the potential difference across 3Ω resistor.

11 / 72

A filament lamp has a resistance of 180Ω when the current in it is 500mA. What is the power dissipated in the lamp?

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A metal cube with sides of length "a" has electrical resistance R between opposite faces. What is the resistance between the opposite faces of a cube of the same metal with sides of length 3a?

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A typical mobile phone of 5.0 V and an internal resistance of 200 m Ω. What is the terminal P.D of the battery when it supports a current of 500 mA?

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 The reciprocal of the conductance is called

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When potential difference is applied across the ends of uniform wire of length l and radius r, a current I flow in the wire. If same potential difference is applied to the ends of another wire of the same material but of length 2l and radius 2r, the current in the wire is

16 / 72

When the current is neither drawn from a source nor given to it then:

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A carbon resistor is connected to a battery of 50volt and 2ampere current is passing through it. If voltage is increased to 75volt, the current will become

18 / 72

2 × 10^6 electrons passing through a conductor in 1 ms. Find electric current flowing through conductor:

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The temperature coefficient of resistance of a semiconductor is:

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A total charge of 100 C flows through a 12W bulb in a time of 50 second. What is the  potential difference across the bulb during this time? 

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 If the potential difference across a resistor is doubled:

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Resistance between two opposite faces of square thin film of area 1mm² having thickness of1 micro m if resistivity of material is 10 ^6 Ω will be:

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12 volt battery is applied across 6Ω resistance to have a steady flow of current. What must be the required potential difference across the same resistance to have a steady current of one ampere?

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 Electric charge on an object is measured as 5 micro coulombs. How the value of this charge can be expressed in terms of base unit:

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 If 2 A current passes through a resistor when connected to a certain battery. If the resistance is replaced by the double resistance, then the current will become

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The substances like germanium and silicon have

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 The equivalent current which passes from a point at higher potential to a point at a lower potential as if it represented a movement of positive charges is

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The deviation of I-V graph from the straight line is due to:

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The energy supplied by the cell to the charge carriers is derived from the conversion of

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 The fractional change in resistance per Kelvin is known as

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The heat produced by a current I in the wire of resistance R during time interval t is

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 A wire has resistance 100 Ohm at 0 °C and 200 Ohm at 100 "C. What is its temperature coefficient in K-¹?

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The following four wires are made of the same material and are at the same temperature. Which one of them has highest electrical resistance

34 / 72

SI unit of resistivity is _____

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 You are given four bulbs of 25 W, 40 W, 50 W and 60 W. Which bulb has the lowest resistance?

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 An electrical bulb marked 100 W, 200 V would mean the resistance is

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A 40 W lamp turns half the electrical energy to give light. How much light energy does it give out in 10 s?

38 / 72

 Electrical energy is converted to heat at the rate of_____

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 A 100 W, 200V bulb is connected to a 160 V supply. The actual power consumption would be

40 / 72

A battery is used to light a 24 W electric lamp. The battery provides a charge of 120 C in 60s.

What is the potential difference across the bulb?

41 / 72

A heater coil is cut into two equal parts and only one part is now used in the heater. The heat generated will now be 

42 / 72

Two electric bulbs, one of 200 volt 40 watt and the other 200 volt 100 watt are connected in a house wiring circuit

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If R1 and R2 are respectively the filament resistances of a 200-watt bulb and 100-watt bulb designed to operate on the same voltage, then

44 / 72

1 horse power =_____

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 What will be energy used by the battery if the battery has to drive 6.28 x 10^18 electrons with potential difference of 20 V across the terminal?

46 / 72

 If the current in electric bulb decreases by 0.5%, then the power in the bulb decreases by approximately

47 / 72

A new flashlight cell of emf 1.5 volts gives a current of 15 A, when connected directly to an ammeter of resistance 0.04Ω . The internal resistance of cell is

48 / 72

An electric current source is actually source of 

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Internal resistance is the resistance offered by____

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 Internal resistance of ideal current source is

51 / 72

 An 8Ω resistance connected to a battery with internal resistance draws 1.6 A and if a 30Ω resistance is connected to the same battery if draws 0.5 (A. What is the current drawn by a 652 resistance from this battery?

52 / 72

If r=0, R= ∞, (V=ε-Ir) then

53 / 72

If a wire conductor of 0.2 ohm resistance is doubled in length, its resistance becomes

54 / 72

 When Cu and Ge are cooled to- 150 °C Then resistance of Cu____ and that of Ge____

55 / 72

 The resistance of a wire is 1Ω. Which of the following is new resistance if length of wire is doubled?

56 / 72

A wire of resistance R is stretched four times its length uniformly. Its new resistance will be

57 / 72

A wire of resistance R is cut into two equal parts, its resistance becomes R/2, what happens to resistivity:

58 / 72

When a wire is stretched double of is length, then its resistance will be

59 / 72

Which of the following have the same temperature coefficient of resistivity?

60 / 72

A wire 100cm long and 2.0 mm diameter has a resistance of 0.7 ohm, the electrical resistivity of the material is

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The example for non-ohmic resistance is 

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 When the length and area of cross-section both are doubled, then its resistance

63 / 72

The resistance of a wire of uniform diameter d and length is R. The resistance of another wire of the same material but diameter 2d and length 41 will be

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The following four wires are made of the same material and are at the same temperature. Which one of them has highest electrical resistance

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The charge of an electron is 1.6 × 10^-19 (c) How many electrons strike the screen of a cathode ray tube each second when the beam current is 16 mA

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Which equation is used to define resistance?

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For an ohmic conductor, doubling the voltage without changing the resistance will cause the current to

68 / 72

Ohm's law establishes a relation between 

69 / 72

Which of the following statements is not true?

70 / 72

The current in a resistor is 8.0 mA. What charge flows through the resistor in 0.020 s?

71 / 72

Graph between V and I for non-ohmic devices

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An electric current is passed through a circuit containing two wires of the same material, connected in parallel. If the lengths and radii of the wires are in the ratio of 4/3 and 2/3, then the ratio of the currents passing through the wire will be

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