Question

Three resistance 40 ohm , 60 ohm, and 90 are connected in series? whqt it its equovalent resistance? ​

Answer 1

Answer:

Let R1 = 40 ohm

R2 = 60 ohm

A/c to question ,

R1 and R2 are in series combination,

so, equivalent Resistance (Req) = R1 + R2

Req = 40 + 60 = 100 ohm

now ,

we know ,

Heat = I²Rt

also , V = IR ( according to ohm' s law )

Heat = (V/R)² ×R × t

= V²× t/R

here,

Req = R = 100 ohm

V = 220 volt

t = 30 sec

then,

Heat = (220)² × 30/100 Joule

= 48400 × 30/100 Joule

= 484 × 30 Joule

= 14520 Joule

hence, heat = 14520 Joule

Explanation: