Physics Paper 2: Topics 8-15 Flashcards
Give the units for the following measurements: Frequency Force Energy Power Pressure Electric charge Electric potential difference Electric resistance Magnetic flux density
Frequency, Hz Force, N Energy, J Power, Watt Pressure, Pascal Electric charge, Coulomb Electric potential difference, volt Electric resistance, Ohm Magnetic flux density, Tesla
What three units of measurement are bigger than centimetre, and three shorter than it. List them all in size order, and give their units as well
Giga, G Mega, M Kilo, K Centi, c Milli, m Micro, u Nano, n
What are the four types of energy transfer
Mechanically (forced doing work)
Electrically (moving charge doing work)
Heating
Radiation
What’s the equation for work done by a force on an object
Work done = force x distance (moved in direction of force)
Potential difference equation
Pd = current x resistance
What is the equation for power of an object
Power = work done / time taken
Energy transferred equation
Energy transferred = charge moved x potential difference
Charge equation
Charge = current x time
Energy transferred (when oassing through components) equation
Energu transferred = current x volts x time
Power of appliance equation
Power of appliance = energy transferred/ time
Electrical power equations
Electrical power = current x potential difference
Electrical power = current ^2 x resistance
How’s right hand thumb rule work
Point right thumb in direction of current, curl fingers. They’re in direction of magnetic field
How’s LEFT hand rule work
Point first finger (next to thumb) in direction of magnetic field. 2nd finger in direction of current. Thumb is pointing in direction of the force
Equation for magnetic flux density
Force = magnetic flux density x current x length
Equation to show efficiency of transformers
Vp x Ip = Vs x Is
