Question

66)Three resistors ,2 ohms , 3 ohms and R ohms are connected in series to a battery of voltage 20V .If the current through the circuit is 1 ampere, then the value of R is _____ ohms.

Answer 1

equivalent resistance = 5+R
v=20
I=1
so
V=IR
20= 1*(5+R)
R=15 ohm

Answer 2

hey there,

so resistor are connected in series so

=) equivalent resistance = 2 +3+R

= 5+R

=)potential difference =20 V.

=) current flowing = 1 ampere

from ohm's law

=) V = IR

=) 20 = 1( 5+R)

=) R = 20 - 5 = 15 him

so value if R = 15 ohm

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hope it will help u