GCSE Physics

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Author:
ghoran
ID:
172791
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GCSE Physics
Updated:
2012-09-24 01:15:59
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Unit two part three currents electrical circuits
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  1. What is the symbol for a switch
  2. What is the symbol for a key
  3. What is the symbol for a cell
  4. What is the symbol for a battery
  5. What is the symbol for a diode
  6. What is the symbol for a resistor
  7. what is the symbol for a variable resistor
  8. What is the symbol for an LED
  9. what is the symbol for a lamp
  10. what is the symbol for a fuse
  11. Wheat is the symbol for a voltmeter
  12. What is the symbol for a thermistor
  13. what is the symbol for an ammeter
  14. what is the symbol for an LDR
  15. Current flowing through a component in a circuit is measured in 
    Amperes (A) using an ammeter connected in a series with a component 
  16. The current through a component depends on 
    It's resistance 
  17. The greater the resistance the ...... The current per a given p.d. Across the component 
    Lower 
  18. Adding extra bulbs in series add 
    Extra resistance this decreases the current 
  19. The p.d. Across a component is measured in 
    Volts (V) using a voltmeter 
  20. The p.d. Provided by cells connected in a series is the
    Sum of the p.d. Of each cell (depending on the direction in which they are connected)
  21. The resistance of a component can be found by measuring the
    Current through and the potential difference across the component for formula is I = V/R
  22. V represents the
    Potential difference and th unit is volts (V)
  23. I represents the
    Current and the unit is amperes (A)
  24. R represents
    • Resistance and the units are ohms 
  25. If the resistance is 5 and the current is 10 what is p.d.
    • I = V/R 
    • 5 = V/10
    • 5 * 10 = V 
    • 50 V = V
  26. if  the resistance is 25 and the p.d. is 100 what is the current
    • I = V/R 
    • I = 100/25 
    • I = 4 A 
  27. if the current is 1.5 and the p.d. is 3 what is the resistance
    • I = V/R 
    • 1.5 = 3/R 
    • 1.5R = 3 
    • R = 3/1.5 
    • R = 2 ohms 
  28. the p.d. across a compnent in a circuit is measured in 
    volts (V) using a voltmeter connected across the component 
  29. ammeters are always connected in 
    series even in a parallel circuit
  30. voltmeters are always connected in 
    parallel with a compenent even in a series circuit 
  31. the p.d. provided by cells connected in a series is 
    the sum of the p.d. of each cell (depending on the direction in which they are connected)

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