Flashcards
AQA GCSE Physics - P1 Equations
Cards in this deck (22)
- 1What is the equation relating energy transferred, mass, temperature change and specific heat capacity?Energy = mass x temperature change x specific heat capacity
- 2How do you work out mass from this equation?Mass = energy / (temperature change x specific heat capacity)
- 3How do you work out temperature change from this equation?Temperature change = energy / (mass x specific heat capacity)
- 4How do you work out specific heat capacity from this equation?Specific heat capacity = energy / (mass x temperature change)
- 5What 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)
- 6A 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
- 7What 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%) - 8How do you work out the useful energy\power output from this equation?Useful energy\power output = efficiency x total energy\power input
- 9How do you work out the total energy\power input from this equation?Total energy\power input = useful energy\power output / efficiency
- 10What are the units for efficiency, total energy\power input and useful energy\power output?% or decimal, Joules (J) (Energy) or Watts (W) (Power)
- 11An 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%
- 12What is the equation linking energy transferred, power and time?Energy transferred = power x time
- 13How do you work out power from this equation?Power = energy transferred / time
- 14How do you work out time from this equation?Time = energy / power
- 15Name one set of units that can be used for energy transferred, time and power.Joules (J), Seconds (S) and Watts (W)
- 16What is the other set of units that can be used for energy transferred, time and power?Kilowatt-hours (kWh), Hours (Hrs) and Kilowatts (kW)
- 17Bob 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 - 18What is the equation linking speed, frequency and wavelength?Speed = frequency x wavelength
- 19How can you work out frequency using this equation?Frequency = speed / wavelength
- 20How can you work out wavelength using this equation?Wavelength = speed / frequency
- 21What are the units for speed, frequency and wavelength?Metres per second (m/s), Hertz (Hz) and metres (m)
- 22A 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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- Questions on all of the equations in P1 unit for AQA GCSE Physics. Are designed to be done in order.
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- Izzy T
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