Question

Lightbulb A is marked "25 W 120V, "and lightbulb B is marked "100 W 120V " These labels mean that each lightbulb has its respective power delivered to it when it is connected to a constant 120-V source.(f) Find the cost of running lightbulb A continuously for 30.0 days, assuming the electric company sells its product at 0.110 per kWh.

Answer 1

The cost of running the lightbulb A for 30 days at 0.110 per KWh is 1.98

How to determine the energy

We'll beging by calculating the energy used by lightbulb A. This can be obtained as follow:

• Power (P) = 25 watts = 25 / 1000 = 0.025 KW
• Time (t) = 30 days = 30 × 24 = 720 h
• Energy (E) =?

E = Pt

E = 0.025 × 720

E = 18 KWh

How to determine the cost for running the bulb for 30 days

The cost of running the bulb for 30 days can be obtained as follow:

• Cost per KWh = 0.11
• Energy (E) = 18 KWh
• Cost =?

Cost = energy × Cost per KWh

Cost = 18 × 0.11

Cost = 1.98

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