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# ET213 - Group 3: Electricity

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The Power of Life

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### ET213 - Group 3: Electricity

1. 1. Electricity   The  Power  of  Life
2. 2. Outline  of  the  Presenta6on   I.  Charges   II. Current   III. Voltage
3. 3. What  are  charges?      An  atom  with  one  or  more  electrons   missing  becomes  charged.   Two  Types  of  Charges:   Posi6ve  Charge-­‐  protons  exceeds  the   number  of  electrons  (+)  Ex.  Na+   Nega6vely  Charge-­‐electrons  exceeds   the  number  of  electrons.(-­‐)  Cl-­‐
4. 4. Electrical  Forces  and  Charges   The  fundamental  rule  at  the  base  of  all   electrical  phenomena  is  that  like  charges   repel  and  opposite  charges  a9ract.
5. 5. How  charges  are  transferred?   When  electrons  are  transferred  from  the  fur  to   the  rod,  the  rod  becomes  nega6vely  charged.
6. 6. Charging  by  Induc6on
7. 7. Principle  of  Conserva=on  of  Charge     Electrons  are  neither  created  nor  destroyed  but   are  simply  transferred  from  one  material  to   another.
8. 8. What  is  a  Current?   Current  is  the  movement  of  charges  in  a  circuit   Electric  current  is  measured  in  amperes,     symbol  A.   An  ampere  is  the  ﬂow  of  one  coulomb  of  charge  per  second.   When  the  ﬂow  of  charge  past  any  cross  sec6on  is  1  coulomb   (6.24  billion  billion  electrons)  per  second,  the  current  is  1   ampere
9. 9. What  is  Voltage   Voltage  provides  the  energy  to  move   the  charges.(electrons)             Important:  charges  cannot  move  in  a  circuit   without  poten6al  diﬀerence  across
10. 10. Voltage  Source   Power  u6li6es  use  electric  generators  to   provide  the  120  volts  delivered  to  home   outlets   This  means  that  120  joules  of  energy  is   supplied  to  each  coulomb  of  charge  that  is   made  to  ﬂow  in  the  circuit.   A  baVery  is  another  source  of  voltage.  It  provide   varying  amounts  depending  on  its  nature  and  size.
11. 11. References   www.hyperphysics.com