Engineering Review – Electric Circuits I

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Transcript Engineering Review – Electric Circuits I 

OHMS LAW
V = Voltage, I = Currect, R = Resistance of in a circuit
V=I*R
Power:
π‘½πŸ
π‘·π’π’˜π’†π’“ = 𝑰 βˆ— 𝑽 =
= π‘°πŸ βˆ— 𝑹
𝑹
RESISTORS
β€’
Combining resistances in series:
𝑹𝒆𝒒 = π‘ΉπŸ + π‘ΉπŸ … + 𝑹𝒏
β€’
Combining resistances in parallel:
𝑹𝒆𝒒 =
𝟏
𝟏
𝟏
𝟏
+
+β‹―
π‘ΉπŸ π‘ΉπŸ
𝑹𝒏
CAPACITORS
β€’
Combining capacitors in series:
β€’
π‘ͺ𝒆𝒒 =
β€’
Combining capacitors in parallel:
π‘ͺ𝒆𝒒 = π‘ͺ𝟏 + π‘ͺ𝟐 … + π‘ͺ𝒏
β€’
Charge on a capacitor:
𝟏
𝟏
𝟏
𝟏
+ +β‹―
π‘ͺ𝟏 π‘ͺ𝟐
π‘ͺ𝒏
Charge = Q =C*V
C = Capacitance, V = Voltage Across the capacitor
INDUCTORS
β€’
Inductors in series:
𝑳𝒆𝒒 = π‘³πŸ + π‘³πŸ + β‹― 𝑳𝒏
β€’
Inductors in parrellel:
𝑳𝒆𝒒 =
𝟏
𝟏
𝟏
𝟏
+ +β‹―
π‘³πŸ π‘³πŸ
𝑳𝒏
KIRCHOFF’S CURRENT LAW (FOR NODES)
π‘°π’Šπ’ =
β€’
𝑰𝒐𝒖𝒕
This can be applied to a node to determine the current in a leg of the other legs
are know, by summing the currents in and out of the node.
KIRCHOFF’S VOLTAGE LAW
π‘½π’“π’Šπ’”π’†π’” =
β€’
𝑽𝒅𝒓𝒐𝒑𝒔
This means that in any loop of a circuit, the sum of the voltage sources is equal to
the voltage drops caused by the loads.