All Of IGCSE Physics Formulas (All Calculations & Tips)
Learn Today IGCSE・2 minutes read
Physics relies on mathematical formulas for various calculations, such as speed, acceleration, mass, density, forces, momentum, and power. Understanding concepts like resistance, Ohm's Law, circuits, and energy transfer is crucial for accurate calculations in physics.
Insights
- Physics exams heavily rely on math-based formulas for various calculations, covering concepts such as speed, acceleration, mass, density, forces, moment, momentum, power, frequency, resistance, and Ohm's Law.
- Electrical circuits involve crucial calculations like determining resistance in series and parallel circuits, understanding current-voltage graphs to assess resistance, calculating electrical power by multiplying current and voltage, and utilizing potential dividers to split input voltage based on resistor ratios for specific output voltages.
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Recent questions
What is the formula for calculating speed?
Speed is calculated as distance divided by time.
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Summary
00:00
Physics Formulas for Calculations in Exams
- Physics heavily relies on math-based formulas for calculations in exams.
- Speed is distance over time, represented as v = d / t, with units in meters and seconds.
- Acceleration is the change in velocity per unit time, calculated as final velocity minus initial velocity over time.
- Mass is the measure of matter quantity, weight is mass multiplied by gravity (w = m * g).
- Density is mass per unit volume, with the formula m / V and units in kg/m³.
- Forces involve formulas like F = k * x based on Hooke's Law, where force is in Newtons and extension in meters.
- Newton's Second Law gives the formula F = m * a for resultant force, with units in kg, m/s², and N.
- Moment is force times distance, with units in N and meters, crucial in equilibrium calculations.
- Momentum is mass times velocity, with units in kg m/s, considering direction for vector quantities.
- Power is work done over time, measured in Joules and seconds, with units in J/s or Watts (W).
- Specific heat capacity formula is Q = mcΔθ, with mass in kg, energy in Joules, and temperature change in degrees Celsius.
- Frequency is the number of waves per second, calculated as 1 / time in seconds, with units in Hertz (Hz).
- Refractive index formula involves speed in air over speed in medium or sin angles, crucial in light calculations.
- Echo calculations require understanding wave speed, distance, and time, often halving the total distance for accurate results.
- Current is charge over time, with units in Coulombs and seconds, symbolized as I and measured in Amperes (A).
- Resistance is directly proportional to length but inversely proportional to area, affecting circuit calculations.
- Ohm's Law, V = I * R, helps determine resistance in circuits by dividing voltage by current.
- Calculating resistance in a circuit involves adding individual resistances, crucial for current calculations.
14:48
Calculating Circuits, Resistance, Power, and Transformers
- To calculate the current of a circuit with a resistance of 3 ohms, use the formula 3 over 5.
- For a parallel circuit, find the total resistance by using the formula 1 / R total = 1 / 3 + 1 / 3, resulting in 3/2 after inversion.
- Determine resistance from a current-voltage graph by examining the gradient, where a steeper gradient indicates lower resistance.
- Electrical power is calculated by multiplying current with voltage, remembering to convert milliamps to amperes by dividing by 1,000.
- Energy transferred can be found using the formula I current V voltage and time, with power also being calculated as IV.
- Potential dividers split input voltage based on resistor ratios, with voltage out determined by the resistance ratio, exemplified by a 2:1 split yielding 6V and 3V outputs.
- Understanding electromagnetic effects involves recognizing a simple Transformer's components and functions, with calculations involving turns of coil, input/output voltage, and current, as well as power losses in cables.
