Question

A bulb used in a car is rated at 12 V, 48 W. Find the energy consumed in one minute when the bulb is connected to
(a) a 12 V battery,
(b) a 6 V battery.​
Pls Answer in clear form

Answer 1

Explanation:

p = w/t

also I x V

I = 4 A

at 12 v,

we can use the formula VIT

so 12x4x60 ig??

2880 J

ismilarly for 6V

sorry I is 2A for 6 V bc 6 V = half of 12V makes sense?

so the answer is 2 x 6x60 so is 720 J

if this is correct then I can get god marks in today's test lol

Answer 2

$\large\blue{\textsf{✩ Your Answer ✓ }}$

One of the formulas for power is

P=V²/R

Therefore we can find the bulb's resistance using

R = V²/P = (12V)² / 48W= 3 Ω

If we use 6 V instead, the power consumption is

P' = (6V)² /3Ω =12W= 12 J/8

In one minute, the energy consumed is

12 J/8 . 60s=720J

$\small\bold{\textbf{\textsf{{\color{Purple}{Hope \: it \: helps}}}}}$