electricity unit review Flashcards
(21 cards)
how can energy be used in our everyday lives?
it is used to power, houses, businesses, and industries, transportation like cars, airplanes, and boats, as well as electronics and appliances
Order these least energy consumption to greatest: industrial residential transportation, commercial
commercial residential transportation industrial
what is electricity?
electricity is a form of energy that results from charge particles, which can be carried by wires
how are electrons used in electricity?
Electrons are used to move electricity throughout a circuit
how does lightning work? What type of electricity does this demonstrate?
Lightning is a demonstration of static electricity. It works by there being a buildup of an electrical charge
in the cloud that is discharged and pulled towards a opposite or neutral charged object
how is energy measured? name the different instruments used and when they would be used. what are the units for energy?
energy is measured using three instruments of voltmeter ammeter and ohmmeter. Volt metres measure the voltage and are symbolized with V. ammeters measure the current and are symbolized with A. ohmmeters measure the resistance and our symbolized with the ohms law symbol
describe the difference between current and static electricity
current electricity is electricity that moves from one place to another, an example would be a circuit. static electricity is electricity that gathers in a single location like lightning.
what are some primary sources of energy?
Hydro, nuclear, coal, natural gas, biomass, wind, solar, and geothermal
when you rub a balloon against your hair, it tends to stick to clothing walls. Explain why.
When you rub a balloon against your hair electrons transfer and result in the balloon being negatively charged. when you put the balloon on the wall or clothing, which is neutrally charged the positives in the wall/clothing pull towards the negatively charged balloon, this causes the balloon to define gravity and stick
explain why it is hard to stick to magnets together
It can be hard to stick to magnets together because the force will either repel or attract, depending on the sides. When you try to stick same sides together like negative negative or positive and positive the two magnets will pull away from each other due to the magnetic force.
for the following example state what is the power source, the load and the conductor. A phone plugged into the wall charging overnight
The power source is the wall/outlet. The load is the phone. And the conductor is the charging cord.
what is the difference between a series and a parallel circuit
A series circuit only has one pathway for electrons to flow through and a parallel circuit has multiple paths for the electrons to travel through
what is the purpose of a resistor?
The purpose of a resistor is to make it difficult for electricity too flow through them. they slow down and control the amount of electrons that pass through them
list 4 good conductors and 4 good insulators
Conductors -copper, iron, silver water
insulators - plastic rubber ceramic glass
what happens to the current and brightness of light as you add more lights in a series circuit
as you add more lights to a series circuit both the current and brightness will decrease. This is because the lights are in the same pathway meaning the electrons must flow through each one which slows the current down and results in the brightness of the lights to dim
what are ohms equations? What do you need to show in order to receive full marks?
The equations are V = I*R, I = V/R, R = V/I. To get full marks, you must include your givens the formula and the correct answer.
What are some forms of renewable energy?
Wind, solar, Hydro and wood
what are some forms of nonrenewable energy?
Oil, gas diesel plastic
what are pros and cons for renewable energy?
Pros - they are more environmentally friendly, they are reusable, they improve public health by producing less emissions and they can be naturally replaced.
Cons - they are expensive, the construction of dams is harmful to animal and habitats, wind turbines lead to the death of many birds and bats, and they are dependent on weather.
what are the pros and cons for nonrenewable energy
Pros - high density so they can produce large amounts from small sources, they are reliable and not dependent on whether conditions and they are cost-effective
Cons - burning fossil fuels releases carbon emissions into atmosphere, contributes to pollution and climate change and harmful to human health
