Electric Circuit Flashcards
__________ and ____________ are connected by conducting wires through which electric charges moves.
energy source
energy consuming device
a _________ occurs that transfers electron from one terminal to another terminal.
chemical reaction
the maximum potential difference across the terminals
Electromotive Force (emf)
the amount of charge per unit time that passes through a surface that is perpendicular to the motion of the charges.
Electric Current
If the charges moves around the circuit in the same direction at all times, the current is said to be ______
Direct Current
If the charges move first one way and then be oposite way, the current is said to be
Alternating Current
the hypothetical flow of positive charges that would have the same effect in the circuit as the movement of negative charges that actually does occur.
Conventional Current
defined as the ratio of the voltage V pplied accross a piece of material to the current I through the material.
Resistance R
SI unit of Resistance
Volt/ Ampere (V/A) = ohm
the ratio V/I is a _________, where ______ is the voltage applied accross a piece of material and ____ the current through the material
constant
V
I
Electrical Conductor = _ resistivity
low
Electrical Insulators = ____ resistivity
high
there is current in a circuit as result of a voltage, the electric power delivered to the circuit is :
P = IV
SI unit of Power
Watt (w)
There are many circuits in which more than one device is connected to a voltage source.
Series Wiring
it means that the devices are connected in such a way that there is the same electric current through each device.
Series Wiring
Series Wiring
Wiring: each resistor on the ________ wire.
Voltage: _______ for each resistor.
same
different
Series Wiring
Current: _____ for each resistor
Resistance: ___________
same
Increases
Parallel Wiring
Wiring: Each resistor on a __________ wire.
Voltage: ___ for each resistor.
different
same
Parallel Wiring
Current: _______ for each resistor
Resistance: ______________
same
Decreases
Current (I) Formula
I = Voltage / Resistor
Power (P) Formula
P = Current (I) ^2 / Resistor
it means that the device are connected in a such a way that the same voltage is applied accross the device.
Parallel Wiring
When two resistor are connected in ________, each receives current from the battery as if the other was not present.
Parallel
the two resistor connected parallel draw more ____ than does either resistor alone.
Current
Batteries and generators add some resistance to a circuit. This resistance is called ________
Internal Resistance
The actual voltage between the terminals of battery
Terminal Voltage
One alternative to the series-parallel method is to take advantage of Kirchoff’s rules named after their developer ______
Gustav Kitchoff (1824 - 1887)
The two rules, ___________ and ______________ and both arise from principles and ideas that we have encountered earlier.
Junction Role
Loop Role
it states that the total current directed into a junction must equal the total current directed out of the junction.
Junction Rule
express conservation of energy in terms of the electric potential and states that for a closed circuit loop, the total of all potential rises is the same as the total of all potential drops.
Loop Rule
