To use voltmeter as ammeter shunt resistance:

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To use voltmeter as ammeter shunt resistance:

1. R_sh = R_m
  (I/I_m) – I
2. R_sh = R_m I - 1
  I_m
3. R_sh = I - 1 /R_m
  I_m
4. None of these

Correct Option: A

From figure shunt resistance is given by

R_sh =	I_mR_m
	I – I_m

or

R_sh =	R_m
	(I – I_m)-I

or

R_sh =	R_m
	m - 1

where,

m =	I
	I_n

=	current to be measured
	current of the meter