Higher Physics Unit 2
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Created by:
monaghan_j on September 16, 2012
Description:
Revision flashcards for SQA Higher Physics
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23 terms
English | Math / Symbols |
|---|---|
 What happens to a charge in an electric field? | It experiences a force |
| What happens when a charge is moved in an electric field? | Work is done |
| What is the potential difference between 2 points? | The work done moving 1C of charge between the points |
| If 3J of work is done moving 1C between 2 points what is the pd between them? | 3V |
| What are the three main equations for electric fields? | 1) W=QV 2) Ew=Fd 3)Ek=½mv² |
| What is EMF ? | The energy supplied to each coulomb of charge passing through the source |
| What are the main formula for EMF | 1) E= V + Ir 2) E= I(R+r) 3) V=IR 4) lost volts = Ir |
| What is an open circuit? | 1) A source of EMF connected only to a voltmeter 2) As there is no current there are no lost volts 3) The voltmeter can read the actual EMF |
| What are lost volts? | Voltage across the internal resistance |
| What is terminal pd? | The voltage actually available at the output of a supply |
| What is a load resistor? | Any external resistance |
| What is a short circuit current? | 1) When there is no external resistance R=0 2) Current = EMF÷internal resistance (I=E÷r) |
| If a wheatstone bridge is balanced what is the voltage between the two voltage dividers? | Zero |
| What is Capacitance? | How much charge can be stored per volt (C=Q÷V) |
| What is the relationship between the charges stored on 2 plates and the voltage between them? | Directly proportional As on increases so does the other (Q=CV) |
| What is the effect of frequency on resistors and capacitors? | No effect on resistors Capacitors - current increases with frequency |
| What effect do capacitors have on d.c and a.c signals? | Allows a.c to pass Blocks d.c |
| What are op-amps used for? | Increase the voltage of a signal |
| For an ideal op-amp what is the condition for current? | Infinite input resistance No input current |
| For an ideal op-amp what is the condition for voltage? | No pd between the input terminals Both input terminals at the same pd |
| What type of op-amp inverts the input signal? | Inverting Mode |
| What type of op-amp amplifies the difference between the inputs? | Differential Mode |
| When do op-amps become saturated? | When the maximum values of it's power supply have been reached |
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