Physics_Formulas_Updated

Question 1

Current formula

Answer 1

I = Q / t — I: Current (A), Q: Charge (C), t: Time (s)

Question 2

Voltage formula

Answer 2

V = E / Q — V: Voltage (V), E: Energy (J), Q: Charge (C)

Question 3

Ohm’s Law

Answer 3

V = IR — V: Voltage (V), I: Current (A), R: Resistance (Ω)

Question 4

Power formula

Answer 4

P = IV = I²R = V² / R — P: Power (W), I: Current (A), V: Voltage (V), R: Resistance (Ω)

Question 5

Electrical energy

Answer 5

E = ItV — E: Energy (J), I: Current (A), t: Time (s), V: Voltage (V)

Question 6

Parallel resistors (two)

Answer 6

R_T = (R1 × R2) / (R1 + R2) — R_T: Total resistance, R1, R2: Resistances (Ω)

Question 7

Parallel resistors (n identical)

Answer 7

R_T = R1 / n — R_T: Total resistance, R1: One resistor, n: Number of identical resistors

Question 8

Series voltage ratio

Answer 8

R1 / R2 = V1 / V2 — R1, R2: Resistances, V1, V2: Voltages (Series Circuits)

Question 9

Transformer equation

Answer 9

n1 / n2 = V1 / V2 — n1, n2: Coil turns, V1, V2: Voltages

Question 10

Velocity formula

Answer 10

v = s / t — v: Velocity (m/s), s: Distance (m), t: Time (s)

Question 11

Acceleration formula

Answer 11

a = (v - u) / t — a: Acceleration (m/s²), v: Final velocity (m/s), u: Initial velocity (m/s), t: Time (s)

Question 12

Weight formula

Answer 12

W = mg — W: Weight (N), m: Mass (kg), g: Gravity (9.8 m/s²)

Question 13

Force formula

Answer 13

F = ma — F: Force (N), m: Mass (kg), a: Acceleration (m/s²)

Question 14

Work done

Answer 14

E = Fd — E: Work done (J), F: Force (N), d: Distance (m)

Question 15

Power (mechanical)

Answer 15

P = E / t — P: Power (W), E: Energy (J), t: Time (s)

Question 16

Pressure formula

Answer 16

P = F / A — P: Pressure (Pa), F: Force (N), A: Area (m²)

Question 17

Gravitational potential energy

Answer 17

ΔGPE = mgΔh — ΔGPE: Change in GPE (J), m: Mass (kg), g: Gravity (m/s²), Δh: Height (m)

Question 18

Kinetic energy

Answer 18

KE = ½mv² — KE: Kinetic energy (J), m: Mass (kg), v: Velocity (m/s)

Question 19

Momentum formula

Answer 19

p = mv — p: Momentum (kg·m/s), m: Mass (kg), v: Velocity (m/s)

Question 20

Alpha decay

Answer 20

ⁿZ X → ⁿ⁻⁴Z⁻² Y + ⁴₂α — n: Mass number, z: Atomic number, α: Helium nucleus (⁴₂He)

Question 21

Beta decay

Answer 21

ⁿZ X → ⁿZ⁺¹ Y + ⁰₋₁β — n: Mass number, z: Atomic number, β: Electron emitted

Question 22

Wave equation

Answer 22

c = fλ — c: Wave speed (m/s), f: Frequency (Hz), λ: Wavelength (m)

Question 23

Law of reflection

Answer 23

Angle of Incidence = Angle of Reflection — The angles are equal

Question 24

Density formula

Answer 24

ρ = m / v — ρ: Density (kg/m³), m: Mass (kg), v: Volume (m³)

Question 25

Efficiency formula

Answer 25

Efficiency = Useful energy out / Total energy in — Efficiency: Ratio of useful to total energy (×100 for %)