1 / 16

Quantities Symbols Units

Quantities Symbols Units. Electrical formulas VIR. V. volts. I. R. amps. ohms. Electrical formulas PIV. P. Watts. I. V. Amps. Volts. Electrical formulas EPt. E. Joules. P. t. Watts. seconds. Electrical formulas EQV. E. Joules. V. Q. Volts. Coulombs.

monte
Download Presentation

Quantities Symbols Units

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Quantities Symbols Units

  2. Electrical formulas VIR V volts I R amps ohms

  3. Electrical formulas PIV P Watts I V Amps Volts

  4. Electrical formulas EPt E Joules P t Watts seconds

  5. Electrical formulas EQV E Joules V Q Volts Coulombs

  6. Electrical formulas QIt Q Coulombs I t Amps seconds

  7. Question 1- information • An electric kettle is rated 250V 2kW and it is used for 5 minutes • 250V = _______ • 2kW = _______ = _______W • 5mins = _______ = _______s

  8. Question 1- questions • Calculate the • Current flowing through the kettle, I • The resistance of the element, R • The charge flowing through it in 5 minutes, Q • The energy it uses in 5 minutes, E • Use the last two answers to find V

  9. Question 2 - information • A lamp has a filament resistance of 120Ω. It is connected to a 60V supply for 100seconds • List the information • ___ = 120Ω • ___ = 60V • ___ = 100s

  10. Question 2 - questions • Calculate the • Current flowing through the lamp • Power input of the lamp • Charge flowing in 100s • Energy input in 100s

  11. Question 3- information • A 12V car battery can holds 36 000 C of charge. It is connected to a circuit containing 4 lamps. It takes 1 hour to discharge. • List the quantities given in the question

  12. Question 3- questions • Calculate the • Current flowing from the battery • The energy the battery contains • The power output of the battery • The resistance of the circuit

  13. Fuse Calculations 1. A TV is rated 750W and 230V What value fuse should it have in its plug? Chose from 1A 3A 5A 10A 13A? 2. A kettle is rated 2kW and 230V 3. A lamp is rated 60W and 230V

  14. Factors affecting resistance of a conductor • Length – L (m) • Area – A (m2) • Material – ρ (Ωm) • Temperature – T (K)

  15. Factors affecting resistance of a conductor

  16. Resistance formula • R = ρL/A • RA= ρL • L=RA/ ρ • A= ρL/R • ρ= RA/L

More Related