Adv. Physics Unit 10: Electric Circuits
Terms in this set (22)
A low-resistance device connected in series that is used to measure the electric current in any branch or part of a circuit.
An electric current that reverses its direction many times a second at regular intervals, typically used in power supplies.
A device that uses chemical reactions to produce an electric current.
capacitance, C [F]
The ratio of an object's stored charge to its electric potential difference.
An electric device used to store charge that is made up of two conductors separated by an insulator.
An automatic switch that acts as a safety device in an electric circuit by opening and stopping the current flow when too much current flows through a circuit.
A flow of positive charges that move from higher potential to lower potential.
An electric current flowing in one direction only.
electric current, I [A]
A flow of charged particles. Sometimes called electricity. Note, that electric current is defined as the direction a positively charged particle would move. Thus, electric current "flows" in the opposite direction from the actual electrons.
A closed loop or pathway that allows electric charges to flow.
electromotive force, emf [V]
The electric potential difference, measured in Volts, given to the charges by a battery or other power source.
For resistors in series, the sum of all the individual resistors. For resistors in parallel, the inverse sum of all the individual resistors.
A short piece of metal that acts as a safety device in an electric circuit by melting and stopping the current from flowing if a dangerously high current passes through the circuit.
A device that converts mechanical energy (motion) into an electric current.
The resistance within a battery, or other voltage source, that causes a drop in the source voltage when it is delivering a current.
States that the current through a conductor between two points is directly proportional to the potential difference across the two points.
Two principles that apply to DC circuits and networks. The first law states that in an electric network the algebraic sum of the currents in all the branches that meet at any point is zero. The second law states that if any closed circuit is chosen from the branches of an electric network, the algebraic sum of the products formed by multiplying the resistance of each branch by the current in that branch is equal to the algebraic sum of the electromotive forces in the several branches forming the circuit.
resistance, R [Ω]
A property that determines how much current will flow; equal to voltage divided by current.
A device with a specific resistance used to control the current in circuits or parts of circuits.
Occurs when a very low resistance circuit is formed, causing a very large current that could easily start a fire from overheated wires.
voltage, V [V]
An alternative name for the electromotive force.
A high-resistance device used to measure the voltage drop across any portion of a circuit. It is connected in parallel with the part of the circuit being measured.