Definitions
Do the Math
Power and Energy
Power Transmission
Safety!
100
The unit of measurement for current.
What is ampere?
100
If an Xbox uses 185 watts of power and is rated at 12 volts, how much current is being drawn?
P=IV --> 185=I*12 --> I=15.42A
100
Energy that exists in a naturally occurring form.
What is primary energy?
100
A device which is used to increase or decrease voltage without changing the power.
What is a transformer?
100
The amount of current it takes to induce a tingly senesation (not painful).
What is 1mA?
200
The energy that is related to the movement of electrons.
What is electricity?
200
If a 60W light bulb is left on for 7 hours, how much energy is consumed?
E=Pt --> E=60*7=420Wh
200
Energy produced from another energy source.
What is secondary energy?
200
100kV+ high voltage lines
What are transmission lines?
200
Why is high voltage dangerous?
It can burn skin, reducing the skin's natural resistance.
300
The type of power that is characterized by current that changes direction and magnitude.
What is AC power?
300
If a transformer has a secondary coil of 500 turns and a secondary coil of 100 turns, and the voltage in (primary voltage) is 10V, what is the secondary voltage?
Vs/Vp = Ns/Np --> Vs/10 = 500/100 --> Vs/10 = 5 --> Vs = 50V
300
A device with blades, which is turned by a force, e.g. that of wind, water, or high pressure steam.
What is a turbine?
300
A part of the electric grid where voltage is stepped down before being sent to customers.
What is a distribution substation?
300
What motion should be used if you find yourself near downed power lines to get away, only if absolutely necessary?
What is shuffling/hopping?
400
The unit of measurement for electric potential.
What is volt?
400
If 3 60W light bulbs are left on for 7 hours each day for 20 days, how much would the power company charge you? DTE charges $0.13 per kWh.
E=Pt --> E=(3*60)*(7*20) --> E=25200Wh=25.2kWh $=0.13*25.2 --> $=$3.28
400
Which energy source is used the most in electricity generation in the US?
What is coal?
400
A part of the electric grid where voltage is stepped up (or down) before (or after) it is sent over long distances.
What is a transmission station?
400
Why is water dangerous around electricity?
It is conductive and will reduce your skin's natural resistance.
500
Anything such as a light bulb connected to an electric power source such as a battery.
What is a load?
500
If a 12V battery is powering a circuit with a 20 ohm resistor and 40 ohms resistor in series, what is the current through the resistors? (Hint: Find the equivalent resistance first.)
V=IR --> 12=I*(20+40) --> I=0.2A
500
A machine that changes mechanical energy into electrical energy.
What is a generator?
500
The transformer type used to decrease voltage to be sent to homes and businesses.
What is a step-down transformer?
500
What are 3 things that effect the severity of a shock?
amount of current, path of current and length of exposure (voltage, moisture, phase of heart cycle and general health are also acceptable)
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