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Electricity (problem solving). Prepared by: Edward A. Mirador San Bartolome High School. 1. How much electrical energy is used up in 2 hours by a 220 V electric stove whose power rating is 3 kW ?. A – 3 kWh B – 6 kWh C – 440 kWh D – 660 kWh. Correct !. E = P x t. Congratulations.

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electricity problem solving

Electricity(problem solving)

Prepared by:

Edward A. Mirador

San Bartolome High School

slide2
1. How much electrical energy is used up in 2 hours by a 220 V electric stove whose power rating is 3 kW?
  • A – 3 kWh
  • B – 6 kWh
  • C – 440 kWh
  • D – 660 kWh
correct

Correct !

E = P x t

Congratulations

slide4
2. What is the total amount of electrical energy consumed by three 100W lamps and five 50W lamps if these are used for 30 days at an average of five hours daily?
  • A – 0.825 kWh
  • B – 8.25 kWh
  • C – 82.5 kWh
  • D – 825.0 kWh
correct1

Correct !

E = P x t

300W x 150h = 45kW

250W x 150h = 37.5kW

+ 82.5kW

Congratulations

3 how much current is in the filament of a 100 w lamp connected to a 220 v line
3. How much current is in the filament of a 100 W lamp connected to a 220 V line?
  • A – 0.45 A
  • B – 2.2 A
  • C – 4.5 A
  • D – 22.0 A
correct2
I = P / V

Correct !

Congratulations

slide8
4. An electric meter showed an increase in reading of 8 kWh after a flat iron was used. About how many hours was it used if it carried a 5 A current from a 220 V line?
  • A – 1
  • B – 4
  • C – 7
  • D – 40
correct3

Correct !

P = V x I

t = E / P

Congratulations

slide10
5. Fifty identical Christmas lights are connected in series and plugged into a 220V line. Neglecting wire resistance, what is the voltage across each bulb?
  • A – 2.2 V
  • B – 4.4 V
  • C – 110 V
  • D – 220 V
correct4
.

Correct !

Vtotal= V1 + V2 + V3+…+ Vn

n = number of loads

Since R is identical so as the V across

Therefore V = Vtotal / n

Congratulations

slide12
6. Which of the following correctly ranks the equivalent resistance of the three 100 resistors arranged as shown below from greatest to least value??
  • A – 2-1-4-3
  • B – 2-3-1-4
  • C – 2-3-4-1
  • D – 2-4-1-3
correct5
.

Correct !

1. RT = 1/3 R 3. RT = 3/2 R

2. RT = 3 R 4. RT = 2/3 R

Congratulations

sorry

Sorry

That was the wrong answer

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