9_Resistance, Electrical Power and Energy

Draw

It is known that a conducting wire has a length of 100 m, a cross-sectional area of 2.5 mm², and a specific resistance of 17 x 10-7 m. Determine the resistance of the wire!

Draw

If it is known that an object has a power of 500 W in 30 minutes. How much electrical energy is in Kwh?

​Example

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​Mr.Iwan uses the following power tools every day. 4 10W lamps are on for 10 hours, 1 300 W iron is used for 1 hour, 1 100 W TV runs for 6 hours, If the price per kWh is IDR 1,000, calculate the electricity bill that must be paid by Mr. Iwan in March 2021!

Answer

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​Determine in advance the electrical energy consumed every day, namely:

W = 4(10 W)(10 hours) + (300 W)(1 hour) + (100 W)(6 hours)

W = 400 Wh + 300 Wh + 600 Wh W = 1300 Wh

W = 1.3 kWh/day

​Answer

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​In March 2021 there are 31 days, then the electricity bill that must be paid by Mr. Iwan in March 2021 are: Cost = (1.3 kWh/day)(Rp1,000/kWh)(31 days)

Cost = IDR 40,300

Draw

In daily household use:

3 pieces of 50W bulbs on for 5 hours,

5 pieces of 20W bulbs on for 5 hours,

a 150 W TV is on for 4 hours,

a 300 W iron runs 2 hours.

If the price per kWh is Rp. 1,000.00, calculate the electricity bill that must be paid for one month (30 days).

Example

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Happy teaching!Pak Iwan uses the following power tools every day.

4 10W lamps are on for 10 hours,

a 300 W iron is used for 1 hour,

a 100 W TV runs for 6 hours,

If the price per kWh is IDR 1,000, calculate the electricity bill that must be paid by Mr. Iwan in Mar

Subject | Subject

Some text here about the topic of discussion