Energy & Power Flashcards
The opposition to current flow is more properly called?!
Resistance
The force motivating electrons to flow in a circuit is called what?
Voltage
what are the units of resistance
Ohms
One coulomb of charge is equal to?!
6,250,000,000,000,000,000 electrons
What is the standard unit for power? Metric unit for power?
Horsepower, watts
The most common schematic symbol for a resistor is?!
A zig-zag line
What is the total resistance of a series circuit with three resistors of 10, 20, & 30 ohms.?
60 ohms
Convert 1 kilo ohm to ohms.
1000 ohms
What is the total efficiency of 500 workout in 1000 power in?
50 percent
Ohms law is V=IR. What does “I,” “V,” and “R” stand for in the equation?
I=current, V=voltage, R=resistance
If you have a line of 4 resistors in series with 2.3 ohms, 4.6 ohms, 1.4 ohms, 4.5 ohms what is the total resistance?
12.8 ohms
What is efficiency?
The ratio of useful work preformed by a machine or in a process to the total energy expanded or heat taken in.
What is the formula for electric power?
P=IV
What is electric power measured in?
Watts
What is the formula to figure power
P=E/T (power=energy divided by time)
1500 joules, is how many Ws
1500 Ws
How many watts in 1hp
746w= 1hp
What kind of energy does the wind have?
Kinetic energy
1.5Mw = ____kw
1500kw
15kw=______w?
1500w
What’s the base unit measurement of mass?
Kilograms
What’s the unit of efficiency?
Efficiency is unit less!
How much energy is stored if a battery is charged at a rate of 100 Watts for 10 seconds?
1000 Joules
What does 1 horsepower = to?
746 watts
Power in. Power out efficiency Power wasted
1000 500 ? 500
Efficiency= 50%