Description : When an alternating current passes through an ohmic resistance the electrical power converted into heat is?

**Answer** : When an alternating current passes through an ohmic resistance the electrical power converted into heat is true power.

Description : A 200 V dc shunt motor is running at 1000 rpm and drawing a current of 10 A. Its armature winding resistance is 2 Ohm. It. is braked by plugging. The resistance to be connected in series with armature to restrict armature current to 10 A, is

**Answer** : A 200 V dc shunt motor is running at 1000 rpm and drawing a current of 10 A. Its armature winding resistance is 2 Ohm. It. is braked by plugging. The resistance to be connected in series with armature to restrict armature current to 10 A, is 36 Ohm

Description : What happens to the resistance of a wire when its length as well as the cross-sectional area are doubled? A) It doubles B) It becomes 4 times C) It becomes 2π times D) It remains the same

**Answer** : Automatically the resistivity will increase as they are the factors affecting the resistivity

Description : What happens when a current flows through a wire?

**Answer** : Current can produce two effect one is heating effect and second is magnetic effect.

Description : What happens when you reverse the direction of the current in an electromagnet?

**Answer** : When you reverse current direction in an electromagnet, the magnetic poles will also change.

Description : Why does the speed of a DC shunt motor decrease as the load increases?

**Answer** : Because if the load is increasing then the torque must also be increase. If not then the speed of motor will decrease.

Description : Transmission efficiency of a transmission line increases with the

**Answer** : Transmission efficiency of a transmission line increases with the increase in power factor and voltage

Description : Why is voltage increases before transmission?

Description : A sine wave voltage is applied across an inductor. When the frequency of the voltage is decreased, the current decreases.

**Answer** : The question seems to be wrong. Increase in frequency would actually decrease the current through the Inductor. This happens because inductive reactance Xl is directly proportional to frequency. And if frequency increases the value of Xl would ... vice versa. Xl= 2*pi*f*L I=E/Z Z=sqrt(R^2+Xl^2)

Description : what is equivalent resistance when four 4 Ohm resistors are connected in i) series ii) parallel

**Answer** : equivalent resistance

Description : when voltage increases what happens to current ?

**Answer** : Decrease

Description : When both the inductance and resistance of a coil are doubled the value of?

**Answer** : When both the inductance and resistance of a coil are doubled the value of time constant remains unchanged.

Description : When measuring insulation resistance of cables using d.c. source, the galvanometer used should be initially short circuited because (A) Cables have a low value of capacitance which draws a high ... high value of charging current (D) Cables have a low value of capacitance and initial resistance

**Answer** : When measuring insulation resistance of cables using d.c. source, the galvanometer used should be initially short circuited because Cables have a high value of capacitance which draws a high value of charging current

Description : When resistance element of a heater fuses and then we reconnect it after removing a portion of it, the power of the heater will?

**Answer** : When resistance element of a heater fuses and then we reconnect it after removing a portion of it, the power of the heater will increase.

**Answer** : In a capacitor start single-phase motor, when capacitor is replaced by a resistance motor will continue to run in same direction.

Description : What is the mathematical relationship between resistance and conductance?

Description : What is the resistance of a coil which draws 10 A and dissipates 1520 W? A) 152 Ω B) 15.2 Ω C) 1.52 Ω D) None of these

**Answer** : What is the resistance of a coil which draws 10 A and dissipates 1520 W? A) 152 Ω B) 15.2 Ω C) 1.52 Ω D) None of these

Description : Consider a cube of material of sides 1 cm with a resistance of 0.003 Ω between its opposite faces. What is the resistance if the same volume of the material is drawn into a length of 50 cm with a uniform cross – section? A) 0.003 Ω B) 0.15 Ω C) 7.5 Ω D) None of these

**Answer** : Consider a cube of material of sides 1 cm with a resistance of 0.003 Ω between its opposite faces. What is the resistance if the same volume of the material is drawn into a length of 50 cm with a uniform cross – section? A) 0.003 Ω B) 0.15 Ω C) 7.5 Ω D) None of these

Description : What is the resistance of a 160 m wire with a uniform diameter of 0.28 mm, if the specific resistance is 12.32 μΩ-cm? A) 3.2 Ω B) 3.2 μΩ C) 0.8 Ω D) None of these

**Answer** : What is the resistance of a 160 m wire with a uniform diameter of 0.28 mm, if the specific resistance is 12.32 μΩ-cm? A) 3.2 Ω B) 3.2 μΩ C) 0.8 Ω D) None of these

Description : What is the total resistance if 5 resistors of 20 Ω each are connected in series? A) 100 Ω B) 4 Ω C) 20 Ω D) None of these

**Answer** : What is the total resistance if 5 resistors of 20 Ω each are connected in series? A) 100 Ω B) 4 Ω C) 20 Ω D) None of these

Description : What is the relationship between power and resistance?

**Answer** : P = I2R Where P = power I = Current R = Resistance

Description : The initial rate of rise of current through a coil of inductance 10 H when suddenly connected to a D.C. supply of 200 V is_______Vs.

**Answer** : The initial rate of rise of current through a coil of inductance 10 H when suddenly connected to a D.C. supply of 200 V is 20 Vs

Description : How does the resistance of a conductor compare to that of an insulator?

**Answer** : The resistance of a conductor can be significantly lower than the resistance of an insulator, depending on each material's atomic properties.

Description : Name the method used to measure following resistances:- (i) Low resistance (ii) Medium resistance (iii) Insulation resistance (iv) Earth resistance.

**Answer** : Following are the methods used to measure resistances:- (i) Low resistance: 1.Voltmeter-Ammeter Method 2. Kelvin's Double bridge Method (ii) Medium resistance: 1.Voltmeter-Ammeter Method 2. ... of Charge Method (iv) Earth resistance : 1. Fall of Potential Method 2. Earth tester

Description : Define the following terms as referred to battery. a) E.M.F b) Internal resistance c) Ah efficiency d) WAh efficiency

**Answer** : a) E.M.F : The electromotive force of a battery is defined as the energy spent or the work done in taking a unit positive charge around the complete circuit of the battery i.e., in ... input required to restore the initial state of charge, under specified conditions, is called Watt-hr efficiency.

Description : We connected a 35V dc supply to a resistance of 600 Ohm in series with an unknown resistance R.A. voltmeter having a resistance of 1.2 kOhm is connected across 600 Ohm resistance and read 5v. The value of resistance R will be

**Answer** : We connected a 35V dc supply to a resistance of 600 Ohm in series with an unknown resistance R.A. voltmeter having a resistance of 1.2 kOhm is connected across 600 Ohm resistance and read 5v. The value of resistance R will be 2.4 kOhm

Description : Which of the following is the name given to resistance of thin films that are uniform in thickness? A) Area resistance B) Sheet resistance C) Filmy resistance D) None of these

**Answer** : Which of the following is the name given to resistance of thin films that are uniform in thickness? A) Area resistance B) Sheet resistance C) Filmy resistance D) None of these

Description : A network is said to be under resonance when the voltage and the current at the network input terminals are (A) in phase (B) out of phase (C) in phase quadrature (D) in phase, and have equal magnitudes

**Answer** : A network is said to be under resonance when the voltage and the current at the network input terminals are in phase

Description : When electric current passes through a metallic conductor, its temperature rises. This is due to?

**Answer** : When electric current passes through a metallic conductor, its temperature rises. This is due to collisions between conduction electrons and atoms.

**Answer** : When a conductor carries more current on the surface as compared to core, it is due to skin effect.

Description : State the procedure for testing of earth pit resistance with necessary diagrams.

**Answer** : Following procedure (Method) for testing of earth pit resistance with necessary diagrams. 1) Earth Tester : i) Three point method ii) Four point method 2) By Potential drop method 3 ... of that earthing pit. In this test the accuracy is less but electrical rods are not required.

Description : Define resistance with its unit.

**Answer** : Resistance is a measure of the degree to which a substance impedes the flow of electric current induced by a voltage. Or Resistance is the opposition to current flow in an electrical circuit. Unit is ohm.(Ω)

Description : Parallel Reactance and Resistance Example 1

**Answer** : Parallel Reactance and Resistance Example 1

Description : AC Circuits with Resistance but No Reactance

**Answer** : AC Circuits with Resistance but No Reactance AC Circuits with Resistance but No Reactance Series resistances let two resistances R 1 and R 2 are connected in series as shows in figure and there ... voltage. Voltage V A is common to both the branch hence voltage V A is common reference.

Description : Problems on resistance and resistivity

**Answer** : Problem on resistance and resistivity 1 : https://youtu.be/OqavD7OlZUs Problem on resistance and resistivity 2 : https://youtu.be/0eo8VO8cpwk Problem on resistance and resistivity 3 : https:// ... https://youtu.be/3neLRCTz0RQ Problem on resistance and resistivity 13 : https://youtu.be/vBCkvPOiztY

Description : Problem on temperature coefficient of resistance 3

**Answer** : Problem on temperature coefficient of resistance 3

Description : Problem on temperature coefficient of resistance 2

**Answer** : Problem on temperature coefficient of resistance 2

Description : Problem on temperature coefficient of resistance 1

**Answer** : Problem on temperature coefficient of resistance 1

Description : Problem on resistance and resistivity 13

**Answer** : Problem on resistance and resistivity 13

Description : Problem on resistance and resistivity 12

**Answer** : Problem on resistance and resistivity 12

Description : Problem on resistance and resistivity 11

**Answer** : Problem on resistance and resistivity 11

Description : Problem on resistance and resistivity 10

**Answer** : Problem on resistance and resistivity 10

Description : Problem on resistance and resistivity 9

**Answer** : Problem on resistance and resistivity 9

Description : Problem on resistance and resistivity 8

**Answer** : Problem on resistance and resistivity 8

Description : Problem on resistance and resistivity 7

**Answer** : Problem on resistance and resistivity 7

Description : Problem on resistance and resistivity 6

**Answer** : Problem on resistance and resistivity 6

Description : Problem on resistance and resistivity 5

**Answer** : Problem on resistance and resistivity 5

Description : Problem on resistance and resistivity 4

**Answer** : Problem on resistance and resistivity 4

Description : Problem on resistance and resistivity 3

**Answer** : Problem on resistance and resistivity 3