Electricity
What is the difference between static electricity and current electricity?
Static electricity is a buildup of electric charge in one place, while current electricity is the flow of that charge in a closed circuit.
Describe a series circuit and a parallel circuit
Series: all components in a row, a single break turns the whole circuit off
Parallel: components are parallel (alongside) each other, loads may run separately from each other
If a toaster uses 4 A of current with a 120 V power supply, what is its power usage?
480 W
How is most energy "wasted"?
Heat
Name 2 renewable sources of energy
Biomass, hydro, solar, wind
A negatively charged balloon and a neutral wall will...
Attract
Describe an insulator vs a conductor of electricity
Insulators have high resistance, conductors have low resistance. Insulators protect us.
Calculate the energy used by a device rated at 100 W operating for 30 seconds.
3000 J
When a battery is used to produce electricity, the energy transformation that occurs is _________ to _________
Chemical to electrical
Name 2 non-renewable sources of energy
Oil, coal, natural gas
The movement of ____________ results in an electric current.
electrons
Which has greater resistance to electron flow? Copper or tungsten?
Tungsten
What is the percent efficiency of a blender that receives 200 J of input energy and delivers 100 J of output energy?
50% efficient
When a flashlight is turned on, electrical energy gets transformed into __________ and _________ energy
light and heat
What is one major concern about relying heavily on fossil fuels for electricity?
Contributes to climate change, non-renewable
In order to create electricity in a wet cell, you need zinc, copper and ____________.
Acid
A series circuit with 3 light bulbs will be _____________ than a circuit with 1 light bulb
Dimmer
If a 6.0 V battery supplies a current of 3.0 A to a circuit, the resistance of the circuit is:
Remember R = V/I
2 Ohms
Wind turbines are a form of renewable energy. What are the energy conversions that happen in a wind turbine?
Mechanical --> Electrical
Identify a way to reduce energy waste in your home.
Various correct answers...