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Relationship between charge and current
I=\frac{dQ}{dt}
Q=\int_0^{t}I\,dt ——> Q=It
Voltage
V=IR
Kirchhoffs laws
the sum of the currents flowing into a junction is equal to the currents flowing out
the sum of the voltages around any closed loop must equal zero
Power supplied to a circuit
P=IV
Power dissipated in a resistor
P=IV=\frac{V^2}{R}=I^2R
Internal resistance
V=\varepsilon-rI