Question

a tourch bulb is rated at 3v and 600 m A calculate it's
1. power
2.resistance
3.energy consumed if it is lighted for 4 hours.​

Answer 1

V = 3v, I = 600. 10^-3 A

1. Power=V.I

P = 3.600.10^-3

=1.8 W

2. V=IR

R = V/I

=3/600.10^-3

=5 ohm

3. Work = Energy

W = VIT

W = (1.8)4 = 7.2 wh =0.0072kwh

=0.0072 (3.6. 10^6) = 25920 J

Answer 2

1.Power=VI

V=3v

I=6.0×10∧-1 amperes

3×6.0×10∧-1 amperes

=1.8 watts

2.resistance=V/I

=3/6.0×10∧-1

=5 ohms

3.E=pt

(1.8watts)×(4×3600)s

=25,920 joules