Basics
When two objects with neutral charges are brought together, the objects?
repel each other
A walkman uses a standard 1.5 V battery. How much resistance is in the circuit if it uses a current of 0.01A?
150 Ohms
Materials such as copper that allow electricity to flow freely are called
Conductors
What does it mean when an energy resource is said to be “renewable”?
Renewable resources regenerate or can be replaced in a relatively short time period (such as the length of a human life).
If an object has more positive charges, than negative charges, its electrical charge is
Positive
These particles can be easily added or removed from an atom.
A 12 Volt car battery pushes charge through the headlight circuit resistance of 10 ohms. How much current is passing through the circuit?
1.3 A
Materials that don't allow electricity to pass through them so readily, such as rubber and plastic, are called
Insulators
Give three examples of renewable energy resources.
solar energy
geothermal or natural steam energy
wind energy
hydro or tidal energy
biomass, including wood, plant fibers, dried animal dung (waste)
If an object has the same number of positive, and negative charges, its charge is
neutral or no charge
An electric cell that can be recharged is called a
secondary cell
Five resistors are connected in parallel to a 12 V power supply. Each resistor has a resistance of 2.
What is the potential difference across each resistor?
12V
A measure of the rate of coulombs flow past a given point in a circuit is called:
Electric Current
What are “fossil fuels”? Which non-renewable energy resources are “fossil fuels”?
They are called fossil fuels because they were formed over millions and millions of years by the action of heat from the Earth's core and pressure from rock and soil on the remains (or "fossils") of dead plants and animals. They include coal, natural gas, and petroleum.
What are general law of charges:
1) Opposites charges attract
2) Like charges repel
3) Neutral objects are attracted to charged objects
All of the following are good conductors, except
a. mercury b. iron c. paper d. tungsten
c. paper
A hairdryer has is plugged into a 120 V outlet. When it is turned on, it uses 1500 W of electrical power.
a) What is the current flowing through the hairdryer?
12.5 A
The device used to measure electric current is:
What energy resource is most commonly used to make electricity?
Coal
Connecting an object to a large body, like Earth, that is capable of effectively removing an electric charge that the object might have is called
Grounding
When hair sticks to your comb as it is being combed, this is a result of
charging by friction
What is the resistance provided by a 3900W hairdryer connected to a wall outlet if the potential difference across it is 30V?
0.23 Ohms
As you increase the length of a wire, its electrical resistance will
What are the three main types of air pollutants produced by electrical power plants
1 carbon dioxide
2 sulfur dioxide
3 nitrogen oxide
What charge each object have if silk was rubbed against acetate?
silk - negative; acetate - positive