Download presentation

Presentation is loading. Please wait.

Published byByron Calvery Modified over 3 years ago

3
ANS: Electric current is the flow (movement) of electric charge. I = q/t Where I = current in amps (A) q = charge in Coulombs (C) t = time (s) Symbol : IUnits: Amperes (A) Current is measured with an ammeter placed in series in the circuit Conventional current is where electrons travel from +ve to – ve. Natural current is where it travels from a build up of –ve charge to an area deficient in –ve charge namely and area of +ve charge DO EXERCISES PAGE 156 RUTTER DO EXERCISES PAGE 156 RUTTER

4
ANS: Voltage (sometimes also called electric or electrical tension) is the difference of electric potential between two points of an electrical or electronic circuit, expressed in volts V = I/q Where V = voltage in volts (V) I = current in amps (A) q = charge in Coulombs (C) Symbol : VUnits: Volts (V) Often thought of as the change in energy as the charge moves between two points.

5
E = Vq Thus: Where E = change in energy (J) V = voltage in volts (V) q = charge in Coulombs (C) The voltage between two points, distance apart ‘d’, in an electric field ‘E’ V = Ed F = Eq Where E = electric field strength F = force on the charge (N) q = charge in Coulombs (C) DO EXERCISES PAGE 157 -8 RUTTER DO EXERCISES PAGE 157 -8 RUTTER

6
ANS: is defined as the rate at which electrical energy is transferred by an electric circuit. P = IV Where P = power in watts (W) I = current in amps (A) V = voltage in volts (V) Symbol : PUnits: Watts (W) DO EXERCISES PAGE 158 - 9 RUTTER DO EXERCISES PAGE 158 - 9 RUTTER

7
ANS: is defined as a measure of the degree to which an object opposes an electric current through it V = IR Where R = resistance in ohms (Ω) I = current in amps (A) V = voltage in volts (V) Symbol : RUnits: Ohms (Ω) Resistance occurs in all conductors. A good conductor has low resistance and vice versa. The current in a conductor depends on the resistance and the voltage applied across it, Ohm’s Law). Resistance often very large kΩ or MΩ

8
RESISTANCE IN SERIES & PARALLEL R1R1 R2R2 A V1V1 A2A2 V2V2 A V R2R2 R3R3 A3A3 A1A1 I1I1 I2I2 I3I3 V I I I SERIESPARALLEL The current, I, measured by each ammeter has the same value in each part of the circuit. The voltages across the series resistors add up to the supply voltage V s = V 1 + V 2. The equivalent resistance, R s, of the whole circuit is given by: R s = R 1 + R 2. The currents in the parallel components add up to the current from the supply, ie I 1 = I 2 + I 3. The voltage is the same across all branches in parallel The equivalent resistance, R s, of the whole circuit is given by: 1/R p = 1/R 2 + 1/R 3.

9
READ INFORMATION PAGE 162 - 163 COMPLETE RELEVANT EXERCISES FROM RUTTER READ INFORMATION PAGE 162 - 163 COMPLETE RELEVANT EXERCISES FROM RUTTER

Similar presentations

OK

Electricity is caused by the flow (or net movement) of Electrons Electric Current – the rate that positive charges flow in a circuit › Actually a.

Electricity is caused by the flow (or net movement) of Electrons Electric Current – the rate that positive charges flow in a circuit › Actually a.

© 2017 SlidePlayer.com Inc.

All rights reserved.

Ads by Google

Free ppt on brain machine interface research Viewer ppt online maker Ppt on beer lambert law states Download ppt on child labour in hindi Ppt on ipl 6 2013 Ppt on computer malwares anti-malware Ppt on programmable logic controller Ppt on e learning system Ppt on new technology in computers and mobiles Ppt on ethanol production process