calculate:An elcetric lamp is rated 240V and 40W. What is the cost of running the lamp for 62 hours if the elctricity authorities charges #2

Question

calculate:An elcetric lamp is rated 240V and 40W. What is the cost of running the lamp for 62 hours if the elctricity authorities charges #2.50k per KWH

in progress 0
Diễm Thu 4 years 2021-07-16T23:03:31+00:00 1 Answers 10 views 0

Answers ( )

  1. danthu
    0
    2021-07-16T23:04:37+00:00
    Reply

    Explanation:

    The voltage of the lamp, V = 240 V

    Power of the lamp, P = 40 W

    It is running for 62 hours.

    The cost of running is $2.50k per KWH

    Electric power is,

    P = 40×62 Wh

    = 2480 Wh

    P = 2.48 kWh

    At the rate of $2.5 per kWh

    P = $6.2

    So, the cost of running is $6.2 per kWh.

Leave an answer

Browse

Giải phương trình 1 ẩn: x + 2 - 2(x + 1) = -x . Hỏi x = ? ( )