Electricity

Electricity

July 2, 2021

Fill in the Blanks

1.

converts thermal energy to

mechanical energy to do work.

Fill in the Blanks

2. In geothermal power plant,

turns the

turbine which is connected to a generator to

generate electricity.

Fill in the Blanks

3. Heat can do

by transforming into mechanical energy.

Fill in the Blanks

4.

is added to the engine by an external source called hot reservoir.

Fill in the Blanks

5. One of the two major types of heat engine is the

where the fuel combustion takes place outside the engine, like steam engine.

Open Ended

What is electricity?

Open Ended

Arrange the scrambled letters to get the correct words.

Arrange the scrambled letters to get the correct words.

Care to Share and Conserve

2. Answer the question: Why should you conserve and save electricity?

Care to Share and Conserve

1. List down fifteen (15) ways on how to conserve and save electrical

energy at home.

Care to Share and Conserve

3. Create and promote an information campaign on how to conserve electrical energy at home. Use your answers from items 1 and 2. Be creative and resourceful in presenting and promoting your

information campaign.

Fill in the Blanks

1.

is a power station and an industrial facility for the generation

of electricity.

Fill in the Blanks

2.

is a device used to convert mechanical energy to electrical

energy.

Fill in the Blanks

3.

is a device used to raise or lower the voltage and current of two-linked alternating current circuits.

Fill in the Blanks

4.

is a device with fanlike blade that turn when pushed, for example, by water or steam.

Fill in the Blanks

5. Before electricity reaches your home, it is generated by using energy

resources such as ___(5a)____, ___(5a)____, ___(5a)____, and ___(5a)____,

Fill in the Blanks

The sources turns turbine which is connected to a generator to produce

electricity. Thus, the energy transformation in electrical power plant

is __ (5b) ____ to ___ (5c) ____.

Multiple Choice

1. Electricity is generated from different sources of energy. Which one is

nonrenewable?

• A. Geothermal

• B. Nuclear

• C. Solar

• D. Wind

Multiple Choice

2. Electricity generation requires basic components. Which of the following is not used in providing electricity?

• A. Consumers

• B. Generators

• C. Transformers

• D. Turbines

Multiple Choice

3. Before electricity reaches consumers, it undergoes series of processes.

Arrange the following to show the correct path of electricity.

I. Distribution lines carry electricity to houses. Electricity passes through

a step down transformer to further lower the voltage before it enters

houses’ circuits.

II. Transmission lines carry electrical energy over great distances.

III. A transformer (step down) lowers the voltage for distribution.

IV. A transformer (step up) raises the voltage for transmission.

V. Power plant generates electricity.

• A. I, II, IV, III, V

• B. II, I, III, V, IV

• C. IV, I, II, III, V

• D. V, IV, II, III, I

Multiple Choice

4. What energy transformation takes place in electrical power plants?

• A. electrical energy to mechanical energy

• B. mechanical energy to electrical energy

• C. electrical energy to thermal energy

• D. thermal energy to electrical energy

Multiple Choice

5. You are a social media influencer and an ambassador for energy

conservation. What practice should you share to save electricity and

conserve energy?

• A. Use incandescent light bulb in your room.

• B. Purchase energy efficient products and appliances.

• C. Turn on and off appliances, alternately, every one hour.

• D. Allow sun’s rays to enter, warm and light your room during sunny day.

Problem Solving

Problem 1

Compute the energy consumption in a system that consumes 190 Watts of power and works for 3 hrs a day.

Problem 2

•A toy car consumes energy of 500 Watts of power if it works for 2 hrs a day using it. Calculate the energy consumption a day.

Problem 3

In a house, there are 5 lamps 25 Watt used 14 hours per day, a 200 Watt refrigerator used 24 hours per day, and a 125 Watt water pump used 8 hours per day. How much electrical energy used for a month (30 days)?

Known:

•Power of lamp = 5(25) = 125 Watt and time of use = 14 hours x 30 = 420 hours

•Power of refrigerator = 200 Watt and time of use = 24 hours x 30 = 720 hours

•Power of water pump = 125 Watt and time of use = 8 hours x 30 = 240 hours