ammeter

Question 1

diff ammeter

Answer 1

it is the device used to measure strong current intesity directly

Question 2

how can you convert the galvanometer to be ammeter

Answer 2

1. zero postion is shifted to the extrme left of the scale
2. a very low resistance called shunt( R_s) is connected in parallel with the coil of the galvanometer

Question 3

diff the shunt

Answer 3

it is a very low resistance connected in parallel with galvonmeter coil to be ammeter

Question 4

the ammeter is connected in series in the electric circuit GR

Answer 4

to be sure that the current passes through the circuit is same that passing through the ammeter to be measured

Question 5

A very low resistance called shunt is connected in parallel with galvanometer coil to be ammeter

Answer 5

1. it allows only a small current ( I_g ) passes through the coil of the galvanometer while most of the current is must pass through the SO it extends the range of the galvanometer measurment
2. it makes the ammeter as a whole has very low resistance to be sure that the measured current is unaffected after connecting the ammeter in series in the circuit

Question 6

it adivsable to make the ammeter has very small resistance GR

Answer 6

to be sure it will not affect the intensity of the current passes through the circuit

Question 7

proff the relation of the shunt resistoer

Answer 7

Draw page 93

I_g x R_g = I_s x R_s

I_g x R_g = ( I_t – I_g ) x R_s

R_s = I_g x R_g \ I_t – I_g

Question 8

from the relation of the shunt resistance

what is ( R_s )

what is rhe ( I_g )

what is the ( I )

what is ( R_g )

Answer 8

1. shunt resistance
2. current allowed passing through the galvonmeter coil producing full scale deflection
3. the maximum total current be measured by the ammeter
4. Resistance of the coil of the galvonmeter

Question 9

by adiing shunt what will happen to the sensitivtiy and the it will meacure……………. current

Answer 9

the senstitivty of the ammeter will decrease as it will measure higher current

Question 10

by decrease the shunt what will happen to the sensitivtiy and the it will meacure……………. current

Answer 10

the senstitivty of the ammeter will decrease as it will measure higher current

Question 11

the maxmium current that can be measured by the ammeter depend on

Answer 11

the value of the shunt