Question

(b)
A torch bulb is rated 5 V and 500 mA. Calculate its
(i) Power
(ii) Resistances
(iii) Energy consumed when it is lighted for 24 hours.​

Answer 1

V=5volts

current = 500mA=500/1000 ampere =0.5A

1.power=VI =

$5 \times 0.5 = 2.5$watts

2.R. = V/I= 5/0.5. = 10ohm

3.energy consumed=power×time.

=2.5×60×60 ×24watt/seconds. (24hrs=60×60×24 seconds)

=216000watt per seconds joules

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