use the equations ๐ = ๐ผ๐ก ๐๐๐ ๐ = ยฑ๐๐ (N refers to number of charges) to solve problems;
1.2. define the โCoulombโ;
1.3. define potential difference and the โVoltโ;
1.4. use the equation V = W/Q to solve problems;
1.5. use the equation V = IR to solve problems;
use the equations P = IV, P = I2R, P = V2 /R to solve problems;
1.7. use the formula ฯL R= A to determine resistivity
derive the equation I = nqvA for charges moving in a metal (n = charge density); and
1.11. use the equation I = nqvA for charges moving in a metal (n = charge density).
compare Ohmic and nonOhmic devices using an IV graph;
sketch the variation of resistance with temperature for a thermistor with negative temperature coefficient;
solve problems involving terminal p.d. and external load, given that sources of e.m.f. possess internal resistance;
Draw and interpret circuit diagrams
Apply kirchhoffโs laws
derive the formula for the effective resistance of two or more resistors in series or parallel;
use the formula for two or more resistors in series or parallel;
explain the difference between electrical conductors and insulators; An electron model should be used in the explanation.
use Coulombโs Law: ๐น = ๐1๐2 4๐๐0๐ 2 to calculate the force between charges in free space or air to solve problems;
use ๐ธ = ๐ 4๐๐0๐ 2 for the field strength due to a point charge
calculate the field strength of the uniform field between charged parallel plates
calculate the force on a charged particle in a uniform electric field;
describe the effect of a uniform electric field on the motion of charged particles;
solve numerical problems involving the motion of charged particles in a uniform electric field;
compare the motion of charged particles in a uniform electric field to that of a projectile in a gravitational field; 3.9. use the fact that the field strength at a point is numerically equal to the potential gradient at that point;
use the equation ๐ = ๐ 4๐๐0๐ for the potential due to a point charge; and,
find the potential at a point due to several charges.
define capacitance; 4.2. use the equation Q C= V to solve problems; 4.3. use the formula ฮตA C= d ; ๐ถ = ๐๐๐๐๐ด ๐ ฮตr โ relative permittivity or dielectric constant ฮต0 โ permittivity of free space.
derive formulae for capacitors in parallel and series to solve problems;
use formulae for capacitors in parallel and series to solve problems;
use the formulae for energy stored in a capacitor as ๐ = ๐ถ๐2 2 , ๐ = ๐๐ 2 ๐๐๐ ๐ = ๐ 2 2๐ถ to solve problems;
Recall the equations for capacitor charge and discharge (RC is the time constant and measured in seconds)
use the equations for capacitor charge and discharge;
and, 4.9. sketch graphs illustrating the charge and discharge of a capacitor.