The division marked on the scale of an a.c. ammeter are not equally spaced. Why ?

A galvanometer has a current sensitivity of 5 divisions per milliampere and voltage sensitivity of 1 division per millivolt. The galvanometer has 30 divisions and it is to be used as an ammeter to read 6 A. This requires a shunt of value

What do you mean by the admittance of an a.c. circuit ?

Which value of a.c. is measured by a.c. ammeter?

A spectrometer gives the following reading when used to measure the angle of a prism. Main scale reading =58.5 degree Vernier scale reading =0.9 divisions Given that 1 divisions on main scale corresponds to 0.5 degree. Total divisions on the vernier scale is 30 and match with 29 divisions of the main scale. the angle of the prism from the above data is :

A screw gauge gives the following reading when used to mesure the diametre of a wire. Main scale reading : 0mm Circular scale reading : 52 divisions Given that 1mm on main scale corresponds to 100 divisions of the circular scale. the diameter of wire from the above data is :

Two full turns of the circular scale of a screw gauge cover a distance of 1 mm on its main scale . The total number of divisions on the circular scale is 50. Further more it is found that the screw gauge has a zero error of - 0.02 mm . While measuring the diameter of a thin wire , a student notes the main scale reading of 3 mm and the number of circular scale divisions in line with the main scale as 37. The diameter of the wire is

The density of a solid ball is to be determined in an experiment. The diameter of the ball is measured with a screw gauge, whose pitch is 0.5mm and there are 50 divisions on the circular scale. The reading on the main scale is 2.5mm and that on circular scale is 20 divisions. if the measured mass of the ball has a relative error of 2% , the relative percentage error in the density is

In a experiment the angle are required to be measured using an instrument. 26 divisions of the main scale exactly coincide with the 30 divisions of the vernier scale . If the smallest division of the main scale is half -a-degree (=0.5^(@)) then the least count of the instrument is .

Two full turns of the circular scale of a screw gauge cover a distance of 1 mn on its its main scale . The total number of divisions on the circular scale is 50. Further m it is found that the screw gauge has a zero error of - 0.02 mm . While measuring the diameter of a thin wire , a student notes the main scale reading of 4 mm and the number of circular scale divisions in line with the main scale as 37. The diameter of the wire is

Why do we not use resistor to control a.c.?