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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