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8 months ago

At $.110 per kWh, what does it cost to leave a 40-W porch light on day and night for a year?

Physics

1 answer:

nlexa [21]8 months ago

4 0

The cost of electricity be $ 38.544.

<h3>What is electricity?</h3>

Electricity is the passage of charges in a conductor. From one end of the terminal to the other, charges are transmitted. Usually, the terminal moves from positive to negative. Since the nucleus holds the electrons loosely, they can move freely throughout the body.

Watts are units of power used to measure electrical output.

Price of electricity is $ 0.110 per kWh .

If a 40-W porch light on day and night for a year, total amount of electricity spend = power of the bulb × time

= 40 W × 1 year

= 40 W × 365 day

= 40 W × 365 ×24 h

= 350400 Wh

= 350.4 kWh.

Hence, the cost of electricity be = $350.4 × 0.110 = $ 38.544.

Learn more about electricity here:

brainly.com/question/8971780

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Answer:

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The concept to solve this problem is given by Energy Transferred, the equation is given by,

$Q = mc\Delta T$

Where,

Q= Energy transferred

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Replacing the values where mass is 50g and temperature is 80°C to 0°C we have,

$Q = mc\Delta T$

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How Q_1=Q_2, so

$80m=440$

$m=\frac{440}{80}$

$m = 5.5g$

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Answer:

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