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Showing 21 of 21 formulas Page 1 of 1

Capacitance

$$C = \frac{Q}{V}$$

Capacitance definition

📖 Physics 📚 Capacitors

Electric Power

Electrical power relation

📖 Physics 📚 Power

Resistors in Series

$$R = R_1 + R_2 + R_3$$

Equivalent resistance

📖 Physics 📚 Circuits

Resistors in Parallel

$$\frac{1}{R} = \frac{1}{R_1} + \frac{1}{R_2}$$

Parallel resistance

📖 Physics 📚 Circuits

Ohmic Heating

$$H = I^2 R t$$

Heat produced in resistor

📖 Physics 📚 Heating

Capacitor Energy

$$U = \frac{1}{2}CV^2$$

Energy stored in capacitor

📖 Physics 📚 Capacitors

Electric Current

$$I = \frac{Q}{t}$$

The rate of flow of electric charge through a conductor.

📖 Physics 📚 Electricity

Potential Difference

$$V = \frac{W}{Q}$$

Work done to move a unit charge from one point to another.

📖 Physics 📚 Electricity

Resistivity

$$R = \rho \frac{l}{A}$$

Resistance depends on the material, length, and area of the conductor.

📖 Physics 📚 Electricity

Joule's Law of Heating

Heat produced in a resistor is proportional to square of current, resistance, and time.

📖 Physics 📚 Electricity

Electrical Energy

$$E = P \times t$$

Total energy used over a period of time.

📖 Physics 📚 Electricity

Commercial Unit of Energy

$$1 kWh = 3.6 \times 10^6 J$$

Conversion between kilowatt-hour and Joules.

📖 Physics 📚 Electricity

Transformer Ratio

$$\frac{V_s}{V_p} = \frac{N_s}{N_p}$$

Relationship between voltages and number of turns in a transformer.

📖 Physics 📚 Magnetic Effects of Electric Current

Coulomb's Law (Intro)

$$F = k \frac{q_1 q_2}{r^2}$$

The electrical force between two charges.

📖 Physics 📚 Electricity

Current in Series

$$I_{total} = I_1 = I_2 = I_3$$

In a series circuit, current remains the same at all points.

📖 Physics 📚 Electricity

Voltage in Parallel

$$V_{total} = V_1 = V_2 = V_3$$

In a parallel circuit, the potential difference across each branch is the same.

📖 Physics 📚 Electricity

Drift Velocity

$$v_d = \frac{eE\tau}{m}$$

Average velocity attained by electrons in a conductor due to an electric field.

📖 Physics 📚 Current Electricity

Kirchhoff's Junction Rule (KCL)

$$\sum I_{in} = \sum I_{out}$$

Sum of currents entering a junction equals the sum of currents leaving it.

📖 Physics 📚 Current Electricity

Wheatstone Bridge Balance

$$\frac{P}{Q} = \frac{R}{S}$$

Condition for zero current through the galvanometer in a bridge circuit.

📖 Physics 📚 Current Electricity

RMS Voltage (AC)

$$V_{rms} = \frac{V_0}{\sqrt{2}} \approx 0.707 V_0$$

The effective value of an alternating voltage.

📖 Physics 📚 Alternating Current

Impedance (LCR Series)

$$Z = \sqrt{R^2 + (X_L - X_C)^2}$$

Total effective resistance of a series LCR circuit.

📖 Physics 📚 Alternating Current

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