D2 Flashcards
List the three laws of a series circuit
The R adds up
The E adds up
The I remain constant because there is only one path.
Power in a series circuit
Total power is equal to the sum of the power values of the individual resistance components.
Kirchhoff’s voltage law
Around any closed loop, the algebraic sum of all the voltages is zero.
Line loss
P=I^2R
Is expressed in Watts
Line drop
E = I x R
Is expressed in volts
Series aiding
When all of the batteries are connected in series negative to positive
Series opposing
When one or more or the batteries are connected negative to negative effectively canceling each other out.
Laws of a parallel circuit
Voltage stays the same.
Current is the sum of the individual branch current.
The net R is always less than any of the individual branch R values.
Kirchoff’s current law
The sum of the currents in a junction is equal to the sum of the currents leaving that junction.
Power sources are connected in series
To increase the voltage output.
Power sources are connected in parallel
To increase the current capacity.
For parallel batteries, current capacity is equal
To that of one battery multiplied by the number of parallel batteries.
Equal parallel resistors
R(total) = value of resistor / number of resistors
Whenever power sources are to be connected in parallel it is important that they have the same terminal voltage because
a lower voltage source connected to a higher one acts as a load itself, rather than helping share the load
A potentiometer is a variable resistor commonly used
in electronic circuits for varying voltage.
