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CURRENT ELECTRICITY (Electrical Current (Base Quantity w/ SI Unit (pd/emf:…
CURRENT ELECTRICITY
Electrical Current
Formulas
I = Q/t
I = V/R
P = VI
P = E/t
Conventional current vs Electron flow
Conventional current
Positive to negative
Electron Flow
Negative to Positive
Base Quantity w/ SI Unit
I: Current --> Ampere(A)
P: Power --> Watt(W)
E: Energy --> Joules(J)
Q: Charge --> Coulomb(C)
pd/emf: Voltage --> Votl(V)
e.m.f: Work done by a source to drive a unit charge around a curcuit
p.d.: Work done to drive a unit charge through a component between two points in a circuit
Reference Voltage: We can assign the voltage at a particular point to be the reference voltage
Resistance and current
R = V/I
Resistors
Fixed Resistor
Variable Resistor
Ohm's Law
V∝ I
Expressing physical quantities
Scientific notation
Prefixes
Benefits of knowing energy and power used by electrical components
Heat is produced when current passes through a conductor. This is called the HEATING EFFECT OF CURRENT
Power
P = E/t
Base and Derived Quantities
Physical quantities: A quantity that can be measured
Base quantities and units
Derived Quantities
