Download (Output power / Input power) x 100 Power in (Watts)

Name: _____________________________________________ Date: ____________________________ Period: ________
Principles of Engineering Quiz Review – Unit 1.2 – Energy Sources

The unit of electrical current is the _______.

Fuels that use animal or food products/by-products are known as _________________________.

The energy of motion or moving objects is called __________________.

A circuit in which all parts are connected end to end forming a single path for current flow _______.

An energy resource that cannot be replaced once used.__________________.

An energy source that will never run out. ___________________.

The mathematical relationship between electrical resistance, voltage, & current is known as _______.

The energy that a piece of matter has because of its position or nature or because of the arrangement
of parts. ___________________.

A term used to describe the energy loss in a system. _____________________.

The amount of charge flowing in a circuit in a period of time is known as _________________.

The unit of electrical resistance is the _______________.

An object raised a distance above the floor or ground has what form of energy? _________________.

Energy derived from the heat that exists in the ground is known as ___________________.

An energy resource that can be replaced when needed. ____________________.

Materials that do NOT allow current to flow through them easily are considered _____.

The rate at which work is performed or energy is expended is known as ______.

The force-like quantity in electrical systems (potential difference) that pushes or moves charge _____.

A result (the product) of a force moving an object a certain distance ___________.

An electrical circuit in which there are multiple loads and multiple paths for current to flow ________.

The ratio of input work/power to output work/power is known as ________________.
Are these energy sources renewable, non-renewable or inexhaustible?
Oil
Solar
Geothermal
Hydroelectric
Natural Gas
Tidal
Biofuels
Wind
Uranium
Ethanol
Coal
Hydrogen
Formulas & Conversions:
Efficiency % = (Output power / Input power) x 100
Power in (Watts) = Volts x Amps
Power = Work / Time
101.97 g = 1 Newton; 1 gm = .0098 Newton; 1 kg = 9.8 Newton;
Work (J) = Force (N) x Distance (m)
1 N-m = 1 joule; 1 meter = 100 cm
Part 2 – Work & Power Calculations:
An 120 volt electric motor that draws 5 amps of current operates a winch that lifts a 100 kg. a distance
of 300 cm. in 5 seconds. Find work done by the winch, input power, output power and efficiency of this
system.
How much weight was lifted?
__________
How many meters did the weight travel?
__________
How much output work (in joules) was done by the system?
__________
What is the output power of the system (in watts).
__________
What is the input power of the system (in watts)
__________
What is the system efficiency?
__________
Part 3 – Electrical Circuits & Ohm’s Law – Include Proper Units with ALL Answers:
A circuit is set up with 12V and a 150 Ohm resistor. Find the current in this system.
__________
A circuit is set up with 9V and has a 20mA current running through the system. Find resistance.
__________
A circuit has a 1 K-Ohm resistor and has a .05A current running through it. Find voltage.
__________
42. Using the laws of circuit theory, solve for RT, IT, VR1,
VR2, & VR3. Be sure to put your answer in proper
engineering notation and use the correct units.
=
390 Ω
43. Using the laws of circuit theory, solve for RT, IT, IR1, IR2, &
IR3. Be sure to put your answer in proper engineering
notation and use the correct units.
1.5 KΩ
12 V
7.4 KΩ
24 V
3.2 KΩ
2.4 KΩ
470 Ω
RT = _________ IT = _________
RT = _________ IT = _________
VR1 = ________ VR2 = ________ VR3 = ________
IR1 = ________ IR2 = ________ IR3 = ________
Ohm’s Law Formulas: V = I x R
Resistance in Series: RT = R1 + R2 + R3
R=V/I
I=V/R
Resistance in Parallel: RT =
1
1/R1 + 1/R2 + 1/R3