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15 Cards in this Set
- Front
- Back
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Calculate the cost of using appliances for varying amounts of time |
Energy (kWh) = power (kW) x time (hr) PET |
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Work out the voltage |
Voltage = currant x resistance VCR |
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Calculate the resultant force |
Force (N) = mass (kg) x acceleration (m/s squared) FMA |
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Calculate speed |
Speed = distance ÷ time (speed=mph) |
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Calculate speed of wavelength |
Velocity = frequency of waves per second. (If time take for 1 wave to pass is 2 seconds, then 0.5 waces will pass every second. |
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Calculate the weight of an object |
Weight (N) = mass (kg) x gravity (N/kg) |
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Light travels at... |
300,000 km/s |
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Doppler effect |
Siren driving past. As its beside you= high frequency As it goes away= low frequency. |
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Calculate the efficiency |
Efficiency= Useful energy ÷ total energy in. (Answer in %) |
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Calculate the gravitational potential energy |
GPE (j) = Mass (kg) x gravity (N/kg) x height (m) |
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A train has a mass of 1500kg and a kinetic energy of 10500j. Determine its speed. |
Kinetic energy= 10500j Mass = 1500kg Velocity= ? KE = 1/2 x m x v squared. 10500 = 1/2 x 1500 x v squared 10500 = 0.5 x 1500 = 750 10500 ÷ 750 = 14 14= find square root of 14 V = 3.74 m/s |
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Calculate kinetic energy. |
KE= 1/2 x m x v squared |
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Calculate efficiency |
Energy efficiency = useful output ÷ total input |
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Calculate current |
E energy = power x time P x T |
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Calculate resistance |
Potential diff (v) ÷ Currant (A) = Resistance (R) |
