ENERGY SOURCE
What is the main energy source that drives the water cycle and provides energy for solar panels?
SUN
What device converts mechanical energy into electrical energy in a power plant?
Generator
What device converts electrical energy into mechanical energy?
Electric motor
What unit is used to measure electrical energy consumption on an electricity bill?
Kilowatt-hour (kWh)
What is the standard unit used by electric companies to measure household electrical energy consumption?
Kilowatt-hour (kWh)
What type of energy source comes from resources that can naturally be replenished?
Renewable energy
What part of the electrical power system carries electricity over long distances from power plants?
Transmission lines
What device converts mechanical energy into electrical energy?
Generator
An appliance has a power rating of 1,000 W and operates for 2 hours. How much electrical energy does it consume?
2 kWh
A 500 W television operates for 4 hours. How much electrical energy does it consume in kWh?
2 kWh
Give one example of a nonrenewable energy source used to generate electricity.
Coal -A fossil fuel formed from ancient plant matter, widely used in power plants.
Oil-Extracted from underground reservoirs, refined into fuels like gasoline and diesel.
Natural Gas-A fossil fuel mainly composed of methane, used for heating, electricity, and industrial processes
Nuclear energy (Uranium) -Produced by splitting uranium atoms in nuclear reactors; uranium is finite and mined from the Earth.
What device increases voltage for efficient long-distance electricity transmission?
Step-up transformer
What scientific principle explains how changing magnetic fields can produce electric current?
Electromagnetic induction
A household consumes 150 kWh of electricity. If the rate is ₱14.96 per kWh, what is the energy cost before other charges?
Php. 2, 244.00
A 1,500 W electric kettle is used for 30 minutes daily for 5 days. If electricity costs ₱14.96 per kWh, how much does the kettle's electricity use cost?
₱56.10
What renewable energy source uses moving air to turn turbine blades?
Wind energy
What part of the electrical system delivers electricity from distribution lines to homes and buildings
Service lines or service connections
What happens to the motor when electrical current flows through a coil in a magnetic field?
A force acts on the coil (Electromotive Force), causing it to rotate.
A student notices a frayed electrical cord while an appliance is plugged in. What should the student do?
Do not touch the damaged cord or attempt to repair it while connected. Keep others away and ask a qualified adult or electrician to disconnect and repair or replace it safely.
A student uses a 100 W electric fan for 8 hours each day. The cost of electricity is ₱12 per kWh.
Question: How much electrical energy does the fan consume in one day, and what is the total cost for that energy?
Correct Answer: A. 0.8 kWh, ₱9.60
Why are fossil fuels considered nonrenewable energy sources?
They take millions of years to form and are consumed much faster than they can be replaced.
Why is electricity transmitted at high voltage?
High voltage allows the same power to be transmitted at lower current, reducing energy lost as heat in the wires.
A bicycle dynamo produces electricity when the wheel turns. Is it acting as a motor or a generator? Explain
It acts as a generator because it converts mechanical energy from the turning wheel into electrical energy.
A transmission line carries electricity at 250,000 volts from a power plant to a substation 200 km away. If engineers decided to transmit the same amount of power at only 25,000 volts, what would happen to the current in the wires, and how would this affect energy losses during transmission?
A. The current would decrease, and energy losses would be smaller.
B. The current would increase, and energy losses would be larger.
C. The current would stay the same, and energy losses would not change.
D. The current would decrease, but energy losses would increase.
B. The current would increase, and energy losses would be larger.
What changes can you make to use energy more wisely?"
Ways to Use Energy More Wisely
Turn off lights, fans, and appliances when not in use.
Unplug devices instead of leaving them on standby.
Choose energy‑efficient appliances (like LED bulbs).
Use natural light during the day whenever possible.
Limit the use of high‑power appliances and share them responsibly.
Remind classmates and family members to practice energy conservation.