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15 Cards in this Set
- Front
- Back
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Electric current |
An electric current is a closed path on which electrons can flow |
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Voltage difference |
The force that causes electrons to flow |
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Resistance |
Tendency of a material to resist the flow of electrons. Typically changes electrical energy to other forms of energy |
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Electrical power |
The rate at which electrical energy changes from one type to other types |
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Electrical energy |
How electrical companies calculate electrical power usage by hours |
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Ohm's law |
Voltage difference current and resistance are related in a simple circuit |
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Static electricity |
an accumulation of excess electrons on an object |
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Static discharge |
It's a transfer of charge between two objects because of the buildup of static electricity |
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How an atom matter can become electrically charged |
an atom or matter becomes electrically charged when it's electrons and protons are no longer equal. When they are equal its neutral but then electrons from other places come to the neutral atom. The uneven amount of electrons to protons make it electrically charged. |
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How are current voltage difference and resistance related |
ohm's law states that voltage difference resistance and current are all related in a simple circuit following the equation I equals v over r. as the voltage difference increases the current increases to but not the resistance. As the resistance increases the voltage difference and current decrease. As the current is increase the voltage difference is also increased but there was a distance stays the same |
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How does temperature affect resistance |
The greater the temperature the greater the resistance. Remember the sweaty human analogy. |
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How does length affect resistance |
if a wire is longer than the electrons have more space to pass through and it's a greater distance which doesn't really allow electrons to pass through as fast. though if the voltage difference is higher, the electrons will be able to pass through faster but the length of the wire is going to create a further distance. |
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How does thickness affect the resistance |
the thicker the wire, the lower the resistance. This is because the electrons have more space to go through and won't run into other electrons as they are traveling. |
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How is the electrical current organized in a household circuit? |
The main switch and circuit breaker or fuse box act as electrical headquarters for your home. Parallel circuits Brent out from the breaker or fuse box and give power to major appliances lights and many more thing in your house. if many appliances are connected more current will flow through the wires since many appliances draw current from the same circuit. as the current increases so does the amount of heat produced in the wires and if the wires get too hot and insulation can melt and the bare wires can cause a fire. |
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Safety devices |
list them and explain |
