# AQA GCSE Physics - P1 Equations

### Description

Questions on all of the equations in P1 unit for AQA GCSE Physics. Are designed to be done in order.
Flashcards by Izzy T, updated more than 1 year ago
 Created by Izzy T over 8 years ago
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## Resource summary

 Question Answer What is the equation relating energy transferred, mass, temperature change and specific heat capacity? Energy = mass x temperature change x specific heat capacity How do you work out mass from this equation? Mass = energy / (temperature change x specific heat capacity) How do you work out temperature change from this equation? Temperature change = energy / (mass x specific heat capacity) How do you work out specific heat capacity from this equation? Specific heat capacity = energy / (mass x temperature change) What are the units of energy, mass, temperature change and specific heat capacity? Joules (J), Kilograms (Kg), Degrees Celsius (C), Joules per kilogram degrees C (J/Kg C) A 60kg block of aluminium is heated by 20 degrees. The specific heat capacity of Al is 900. Calculate the energy transfer. Energy = 60 x 20 x 900 = 1,080,000 J What is the equation relating efficiency, total energy\power input and useful energy\power output? Efficiency = useful energy\power output / total energy\power input (x 100%) How do you work out the useful energy\power output from this equation? Useful energy\power output = efficiency x total energy\power input How do you work out the total energy\power input from this equation? Total energy\power input = useful energy\power output / efficiency What are the units for efficiency, total energy\power input and useful energy\power output? % or decimal, Joules (J) (Energy) or Watts (W) (Power) An LED bulb uses 50J of energy and emits 37J of light energy, 1J of sound energy and 12J of heat energy. Calculate the efficiency of the LED bulb. Efficiency = 37 / 50 (x 100) = 74% What is the equation linking energy transferred, power and time? Energy transferred = power x time How do you work out power from this equation? Power = energy transferred / time How do you work out time from this equation? Time = energy / power Name one set of units that can be used for energy transferred, time and power. Joules (J), Seconds (S) and Watts (W) What is the other set of units that can be used for energy transferred, time and power? Kilowatt-hours (kWh), Hours (Hrs) and Kilowatts (kW) Bob leaves his radiator on for three and a half hours. It uses seventeen kilowatts of power every hour. What is the energy transfer whilst the radiator is on? 17 x 3.5 = 59.5 kW 59.5 x 3.5 = 208.25 kWh What is the equation linking speed, frequency and wavelength? Speed = frequency x wavelength How can you work out frequency using this equation? Frequency = speed / wavelength How can you work out wavelength using this equation? Wavelength = speed / frequency What are the units for speed, frequency and wavelength? Metres per second (m/s), Hertz (Hz) and metres (m) A wave has a frequency of 15,000 Hz and a wavelength of 20,000 m. Calculate its speed. 15,000 x 20,000 = 300,000,000 m/s or 3.0x10^8 m/s

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