Different types of energy:
Start off easy. What is mechanical energy?
Energy of any moving object.
A circuit has a current of 5 and a resistance of 6 what would the voltage be?
5 x 6 = 30 V (volts)
Resistance is measured in what?
OHM's
Give an example of a load
Lightbulbs, motors, heaters.
Charged objects attract neutral objects.
What is ....
Charge separation
A man eats his lunch before going for a bike ride what kind of energy transfer is this?
Chemical - mechanical
You have a voltage of 20 and a resistance of 4, what would the current be?
20 divided by 4 = 5 A (amperes)
The sign for a conductor is:
a) A straight line
b) A zig zag line
c) A loopy line
b) A "c" with a circle around it
A) A straight line
electrorefining is .....
a process that removes impurities from a metal
Movement of electrons, transmitted from one spot to another.
What is ....
Electrical Discharge
Electrical - light and sound
You have 300 Watts of power and 30 volts. How much current is flowing through?
Power divided by volts = 10 A
A household lighting system is an example of which type of circuits?
Parallel
Explain Alternating current (AC). Get 1 point about it:
Electricity flows back and forth 60 times a second. More waste energy than DC. Large electric gen's in power stations produce alternating current for us in homes and industries.
Mechanical resistor that is used to stop overflow of electricity.
What is .....
Fuse
Kinetic energy Faster
You have 250 kilowatts of power and it has been running for 2 hours. How much energy (kilojoules) is being used?
Power x time = 500
What is a condutors job?
Why are wet cells called wet cells?
Because they use liquid electrolytes
A rotating shaft with coil wrapped around it.
What is .....
Armature
A man is mowing a lawn. What different kinds of energy are happening. Name 2 for full points.
Gas in engine - chemical to electrical
Lawnmower being pushed - mechanical
Person straining to push mower - themal
Muscles give energy to push - Chemical
Lawn mower blades spinning - electrical
Joules of useful output DIVIDED by joules of input and then multiplied by 100.
Tricky question, must get all for points.
Insulators have ______ resistance
Conductors have _______ resistance
Super - conductors have ________ resistance
High
Low
No
Explain direct current (DC) Get 2 points about it:
Electricity flows in 1 direction. Many devices such as laptops and phones use it. Requires plugins that require DC comes with power adapters to convert 120V AC - DC. It's not easily converted to higher or lower V.
Split ring that breaks flow of electricity for a moment then reverse connection of the coil.
What is ....
Commutator