Topic 7 Flashcards
Name the 5 places power goes while traveling to our houses.
1.Power generating station
2.Step-up transformer
3.Sub-station
4.Distribution station
5.Step-down transformer
When power reaches our homes a transformer is used to _____ _____ the power.
Step-Down
A ______ ______ records the total electrical energy supplied to your home.
Power meter
What do transformers do to efficiently transfer power through long distances?
They step-up the power
What are the 2 ways electricity can be regulated in your home?
Circuit breakers & fuses
What are the 3 types of electrical wire in cables and what are their colors?
1.Neutral wire-White
2.Hot wire-Black
3.Ground wire-Green
What are transistors?
Tiny switches in digital devices.
What do Neutral (white) wires do?
Returns low energy back to the breaker panel.
What do Hot (black) wires do?
Carries high energy from the breaker panel.
What do Ground (green) wires do?
Channels any extra current into the ground.
What is Binary code?
Two states, on and off representing
numbers and letters
What is the formula to calculate Power?
P=IV
What is power measured in?
Watts
How many digits are in a power meter reading and how to read them?
There are 5 digits in a power meter reading. If the pointer is pointing directly at a number then you use that number but if it is in between two diffrent numbers you choose the smaller one always.
How to find the Power consumed in units when reading power meters?
Take the smaller 5 digit number and subtract it from the bigger number the answer will look something like
(23930 – 20769 = 3161units)
What is the formula for % efficiency?
% = output/input x 100
What is the formula for calculating energy?
Energy= power x time (J=WxS)
