Question

A voltage of 30 V is applied across a carbon resistor with first, second and third rings of blue, black and yellow colours respectively. Calculate the value of current in mA, through the resistor.

Answer 1

Blue - 6

Black - 0

Yellow - 10⁴

∴ R = 60 x 10⁴ Ω

V = 30 volt

So I = \(\frac{V}{R} = \frac{30}{60\times10^4}\)

= 0.5 x 10^-4 = 0.05 mA.