Question

resistance of two resistors is measured as( 20+- 0.2 ) ohm and (40+-0.2) ohm . the maximum absolute error in their series combination will be

a.0.2 ohm
b. 0.1 ohm
c. 0.6 ohm
d.0.4 ohm​

Answer 1

Answer:

(d) 0.4 ohm

Explanation:

In general, the rule for series circuit is that resistances add up in series. Let us say that we have three resistors Ra, Rb and Rc, then

R = Ra + Rb + Rc

Now if they are in parallel circuit, then net resistance reduces.

Its formula is;

1/R = 1/Ra + 1/Rb + 1/Rc

Now as per given information, when the resistors each having an error of -+0.2 are connected in series, then the maximum absolute error would be

=0.2+0.2=0.4