DC Principles Flashcards
What are the names and units for; Charge Current Voltage
Charge (q) - coulomb (C) Current (i) - Ampere (A) Voltage (v) - Volt (V)
A current is a….
Coulomb per second
A volt is a…
Joule per coulomb
What’s the charge on an electron?
-1.6x10^-19C
Current(i) = ?
i(t)=dq(t)/dt = Charge/Time
Total charge through a conductor q(t) = ?
q(t) = t(integral)t0 i(t)dt + q(t0)
Voltage is…
The energy transferred per unit charge that flows through the element
A watt is a…
Joule per second
Power =
Voltage x Current
If energy is ____ it is positive but if it is supplied it is ____
If energy is absorbed it is positive but if it is supplied it is negative
Equation to calculate the power delivered to a circuit element between time instants t1 and t2
w = t2(intergral)t1 p(t)dt
The net current entering and leaving a node is?
0
State Kirchoff’s Voltage Law
The algebraic sum of the voltages equals zero for any closed path (loop) in an electrical circuit
In conductors, the voltage between any 2 points of an ____ conductor is ____ regardless of the current
In conductors, the voltage between any 2 points of an ideal conductor is zero regardless of the current
When 2 points are connected by an ideal conductor they are ____ together
Shorted
There is an open circuit between two parts of the circuit when?
There are no conductors or other circuit elements connected between 2 parts of a circuit
Dependant voltage sources (also knows as ____ ____ ____) are represented by?
(Controlled voltage sources) Diamond shapes
Resistance = ? and ?
R=V/I and R=(pL)/A
Voltage is ____ to ____ in an ideal resistor
Voltage is proportional to current in an ideal resistor
Typical values of resistivity for Conductors = conductors = Insulators =
Conductors = 10^-8 conductors = 0.1 Insulators = 10^21 (‘infinity’)
Conductance is? and so (Symbol, equation and unit)
G which is 1/R and so Ohms^-1 and so i=Gv
Energy = ? (for a battery)
Q.v
Q = ?
i.T
Energy = ? (2 obvious ones)
mgh and 1/2mv^2
