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29 Cards in this Set
- Front
- Back
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people can convert many forms of energy , we can also convert energy or chemical energy into _________ energy, we can also convert thermal energy into other _____ of energy such as mechanical energy |
thermal. forms |
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although energy can be transformed from one kind to another ____ cannnot be created or destroyed |
energy |
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devices that convert electric energy into thermal energy, some examples are clothes irons, and coffee makers |
heating appliances |
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__________devices such as cell phone and computers also get hot when they are in use, however, the _______ energy they produce does not serve a useful purpose |
electronic. thermal |
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a device that regulates the temperature of a system is called a __________ |
thermostat |
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a thermostat has a _________ coil made of two types of metals that ________ and contract at different rates; the coil curls and uncurls, depending on the air ___________ to move a switch that controls a ___________ |
bimetallic. expands. temperature. furnace |
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_________ is a device that uses electric energy to pump thermal energy from a cooler location to a warmer location |
refrigerater |
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_______, which is a fluid, flows through pipes that surround the compartments of the refrigerator; ________ energy is transferred from the inside of the refrigerator to the coolant, which is why the refrigerator stays _________ |
coolant, thermal energy, cold |
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a refrigerator uses __________ energy to move the _________ through the refrigerator pipes |
electrical. coolant |
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starting as a liquid, the coolant passes through ___________ changes into a gas, and becomes ____________ |
valve. cooler |
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the coolant removes the ______ energy from the inside of the refrigerator, so the refrigerator cools off |
thermal energy |
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in the bottom of the refrigerator, there is a ____________ that forces the coolant into a smaller space, which increases the _________ energy of the coolant |
thermal |
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the ___________ releases thermal energy into ____________ around the refrigerator |
coolant. air |
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this change causes the ____________ to become a liquid, and then the cooling cycle begins again |
coolant |
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a machine that convert thermal energy into mechanical energy is a ___________ |
heat engine |
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_______ engine such as those found in moving vehicles and lawn _______ converts thermal energy into ______ energy |
internal combustion engine. mowers. mechanical |
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in a car engine a spark ignites a fuel air mixture which _________ and pushes a piston down |
expands |
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in an automobile engine only about ______ percent of the _____ energy of the fuel gets converted into __________; the rest become heat, which causes the cars _________ to become hot |
20. chemical. mechanical energy. engine |
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________ cannot be created or destroyed |
energy |
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coolant in a refrigerator moves _______ energy from one place to another |
thermal |
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computers and cell phone get hot when you use them because some ________ energy is always converted into _________ energy in an electronic device |
electric. thermal |
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a __________ coil is made up of two types of metal joined together and bent into a coil |
bimetallic |
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to ___________ something is to force it into a smaller space |
compress |
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internal combustion engines use _________ energy to produce thermal energy |
chemical |
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when a heat engine converts thermal energy into mechanical energy, ___________ energy moves a vehicle |
mechanical |
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a machine that converts energy into mechanical energy |
heat engine |
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converts thermal energy into mechanical energy which move a car |
conversion of energy in a heat engine |
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what type of heat engine is used by most cars, buses, boats, trucks, and lawn mowers |
internal combustion engine |
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a tube with a piston that moves up and down |
cylinder |
