VOLTAGE, Current, & resistance. 10/10/2015Template copyright 2005 www.brainybetty.com2 VOLTAGE Volts measure the energy level in a circuit. When you connect.

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Presentation transcript:

VOLTAGE, Current, & resistance

10/10/2015Template copyright VOLTAGE Volts measure the energy level in a circuit. When you connect a battery to a circuit, electrical charges flow out of the battery and can give up some of their energy to devices along the circuit path.

10/10/2015Template copyright The higher the voltage the higher the electrical energy in a battery. Electrical current always flows from high voltage to low voltage. Just like water always flows from high area to low area.

10/10/2015Template copyright Batteries use chemical energy to move electrical charges..

10/10/2015Template copyright VOLTMETER Measures the difference in voltage between two parts of the circuit. If we connect a device that uses energy to a circuit then voltage will be reduced.

10/10/2015Template copyright Current is the flow of electrical charges. –Current in a wire is similar to current in a river. Measured in a unit called amperes (or amps for short). –One amp is equal to one coulomb per second.

10/10/2015Template copyright Current comes in two forms: AC-Alternating Current: changes direction able to travel further distances than DC AC wires stay cooler than DC used in homes DC- Direct Current- does not change direction Batteries suppied used in most scientific laboratories. more dangerous than AC not able to travel as far as AC current or as well

10/10/2015Template copyright Wires that carry electrical charges are almost always made of a metal cord covered by some sort of plastic. CONDUCTIVITY Conductors are materials that are able to carry electrical current easily. –Most metals are good conductors. Insulators are materials that do not carry electrical charge. –Glass, plastic, and other materials are called insulators. Semiconductors are materials that are in between conductors and insulators. –They are able to carry some electrical current.

10/10/2015Template copyright The resistance of an object measures how easily charges flow through it. – High resistance means it is difficult for current to flow. – Low resistance means it is easy for current to flow..

10/10/2015Template copyright Resistance builds up if you put resistance devices in a row (as shown below). Resistance is measured in units called ohms..

10/10/2015Template copyright OHM’S LAW It states that the voltage divided by the resistance equals the current. If resistance goes up current goes down, and vice versa.

10/10/2015Template copyright What time is it… SUMMARY TIME ! YOU HAVE 3 MINUTES TO SUMMARIZE AT LEAST 5 THINGS YOU LEARNED TODAY. MAKE SURE YOU WRITE IN COMPLETE SENTENCES.

10/10/2015Template copyright What time is it… SUMMARY TIME ! YOU HAVE 2 MINUTES TO SUMMARIZE AT LEAST 5 THINGS YOU LEARNED TODAY. MAKE SURE YOU WRITE IN COMPLETE SENTENCES.

10/10/2015Template copyright What time is it… SUMMARY TIME ! YOU HAVE 1 MINUTE TO SUMMARIZE AT LEAST 5 THINGS YOU LEARNED TODAY. MAKE SURE YOU WRITE IN COMPLETE SENTENCES.