Physics-
General
Easy

Question

The diode used in the circuit shown in the figure has a constant voltage drop of 0.5 V at all currents and a maximum power rating of 100 milliwatts. What should be the value of the resistor R, connected in series with the diode for obtaining maximum current

  1. 1.5 capital omega    
  2. 5 capital omega    
  3. 6.67 capital omega    
  4. 200 capital omega    

The correct answer is: 5 capital omega


    The current through circuit i equals fraction numerator P over denominator V end fraction equals fraction numerator 100 cross times 1 0 to the power of negative 3 end exponent over denominator 0.5 end fraction equals 0.2 A
    \ voltage drop across resistance = 1.5 – 0.5 = 1 V
    Þ R equals fraction numerator 1 over denominator 0.2 end fraction equals 5 capital omega.

    Related Questions to study

    General
    physics-

    Current in the circuit will be

    Current in the circuit will be

    physics-General
    General
    physics-

    In the circuit, if the forward voltage drop for the diode is 0.5V, the current will be

    In the circuit, if the forward voltage drop for the diode is 0.5V, the current will be

    physics-General
    General
    physics-

    A 2V battery is connected across the points A and B as shown in the figure given below. Assuming that the resistance of each diode is zero in forward bias and infinity in reverse bias, the current supplied by the battery when its positive terminal is connected to A is

    A 2V battery is connected across the points A and B as shown in the figure given below. Assuming that the resistance of each diode is zero in forward bias and infinity in reverse bias, the current supplied by the battery when its positive terminal is connected to A is

    physics-General
    parallel
    General
    Maths-

    In the figure, ABC; is triangle in which C = 90º and AB = 5 cm. D is a point on AB such that AD = 3 cm and angle A C D = 60º. Then the length of AC is –

    the m-n theorem states that 
     (m + n) cot θ = m cot α – n cot ß
    this gives us the cotangent of the angle CDA which is further used in the sine rule to find the length of AC

    In the figure, ABC; is triangle in which C = 90º and AB = 5 cm. D is a point on AB such that AD = 3 cm and angle A C D = 60º. Then the length of AC is –

    Maths-General

    the m-n theorem states that 
     (m + n) cot θ = m cot α – n cot ß
    this gives us the cotangent of the angle CDA which is further used in the sine rule to find the length of AC

    General
    maths-

    If f(x) =fraction numerator 1 minus x over denominator 1 plus x end fraction, then f left square bracket f left parenthesis sin invisible function application theta right parenthesis right square bracketequals

    If f(x) =fraction numerator 1 minus x over denominator 1 plus x end fraction, then f left square bracket f left parenthesis sin invisible function application theta right parenthesis right square bracketequals

    maths-General
    General
    physics-

    The figure shows four wire loops, with edge lengths of either L or 2L. All four loops will move through a region of uniform magnetic field stack B with rightwards arrow on top (directed out of the page) at the same constant velocity. Rank the four loops according to the maximum magnitude of the e.m.f. induced as they move through the field, greatest first

    The figure shows four wire loops, with edge lengths of either L or 2L. All four loops will move through a region of uniform magnetic field stack B with rightwards arrow on top (directed out of the page) at the same constant velocity. Rank the four loops according to the maximum magnitude of the e.m.f. induced as they move through the field, greatest first

    physics-General
    parallel
    General
    physics-

    A magnet is made to oscillate with a particular frequency, passing through a coil as shown in figure. The time variation of the magnitude of e.m.f. generated across the coil during one cycle is

    A magnet is made to oscillate with a particular frequency, passing through a coil as shown in figure. The time variation of the magnitude of e.m.f. generated across the coil during one cycle is

    physics-General
    General
    physics-

    A square loop of side 5 cm enters a magnetic field with 1 cms-1. The front edge enters the magnetic field at t = 0 then which graph best depicts emf

    A square loop of side 5 cm enters a magnetic field with 1 cms-1. The front edge enters the magnetic field at t = 0 then which graph best depicts emf

    physics-General
    General
    physics-

    Switch S of the circuit shown in figure. is closed at t = 0. If e denotes the induced

    emf in L and i, the current flowing through the circuit at time t, which of the following graphs is correct

    Switch S of the circuit shown in figure. is closed at t = 0. If e denotes the induced

    emf in L and i, the current flowing through the circuit at time t, which of the following graphs is correct

    physics-General
    parallel
    General
    physics-

    The current i in an induction coil varies with time t according to the graph shown

    in figure. Which of the following graphs shows the induced emf (e) in the coil with time

    The current i in an induction coil varies with time t according to the graph shown

    in figure. Which of the following graphs shows the induced emf (e) in the coil with time

    physics-General
    General
    physics-

    A flexible wire bent in the form of a circle is placed in a uniform magnetic field perpendicular to the plane of the coil. The radius of the coil changes as shown in figure. The graph of induced emf in the coil is represented by

    A flexible wire bent in the form of a circle is placed in a uniform magnetic field perpendicular to the plane of the coil. The radius of the coil changes as shown in figure. The graph of induced emf in the coil is represented by

    physics-General
    General
    physics-

    When a certain circuit consisting of a constant e.m.f. E an inductance L and a resistance R is closed, the current in, it increases with time according to curve 1. After one parameter (E, L or R) is changed, the increase in current follows curve 2 when the circuit is closed second time. Which parameter was changed and in what direction

    When a certain circuit consisting of a constant e.m.f. E an inductance L and a resistance R is closed, the current in, it increases with time according to curve 1. After one parameter (E, L or R) is changed, the increase in current follows curve 2 when the circuit is closed second time. Which parameter was changed and in what direction

    physics-General
    parallel
    General
    physics-

    In the following figure, the magnet is moved towards the coil with a speed v and induced emf is e. If magnet and coil recede away from one another each moving with speed v, the induced emf in the coil will be

    In the following figure, the magnet is moved towards the coil with a speed v and induced emf is e. If magnet and coil recede away from one another each moving with speed v, the induced emf in the coil will be

    physics-General
    General
    Maths-

    The equation a x to the power of 2 end exponent plus b x plus c equals 0. where a, b, c are the sides of a ΔABC, and the equation x to the power of 2 end exponent plus square root of 2 x plus 1 equals 0 have a common root. The measure of angle C is-

    in a right angled isosceles triangle, ratio of sides = 1:√2:1
    base angles are = 45 degrees.

    The equation a x to the power of 2 end exponent plus b x plus c equals 0. where a, b, c are the sides of a ΔABC, and the equation x to the power of 2 end exponent plus square root of 2 x plus 1 equals 0 have a common root. The measure of angle C is-

    Maths-General

    in a right angled isosceles triangle, ratio of sides = 1:√2:1
    base angles are = 45 degrees.

    General
    Maths-

    If in a ΔABC, (sin A + sin B + sin C)(sin A + sin B – sin C)= 3 sin A sin B, then –

    the sine rule states that
    a/sin A =b/sin B = c/sinC = 2R
    this is used to find the relation of the angles and sides of the triangles.

    If in a ΔABC, (sin A + sin B + sin C)(sin A + sin B – sin C)= 3 sin A sin B, then –

    Maths-General

    the sine rule states that
    a/sin A =b/sin B = c/sinC = 2R
    this is used to find the relation of the angles and sides of the triangles.

    parallel

    card img

    With Turito Academy.

    card img

    With Turito Foundation.

    card img

    Get an Expert Advice From Turito.

    Turito Academy

    card img

    With Turito Academy.

    Test Prep

    card img

    With Turito Foundation.