Question 2 physics

What is Kirchoff’s law?

• charge is conserved, total charge which enters a junctiion is the same as the charge leaving

  • charge which moves around a closed path, AV = 0

What is ohms law?

• current flowing through a circuit element depends on both potential difference and elements resistance

  • v=ir

What is series resistance?

• current going through is the same

  • Req = r1 + r2

What are parallel resisters?

equivilant resistors = (1/r1 + 1/r2 ) ^-1

What is the equation for capacitance?

Charge = c x v

What is coloumbs law?

• if 2 charged particles having charges q1 and q2 are distances r apart, exert

  • Kq1q2 / r²

What is the first law of electrostatics?

• like charges of electricity repel each other whilst unlike charges attract

What are the second laws of electrostatics?

the forces between 2 point charges

• directly proportional to the product of their strength

• inversly proportional to the square of the distance between them

  • inversly proportional to the absolute permittivity of the surrounding mediu

What is the equation for absolute permittiviity?

e = e0 + er

What is the equation for power?

P =VI

What does it mean if snells law is imposible?

Total internal reflection

If its moving from less to more dense where is the ray moving to?

towards the normal

For a mirror, is the focal length positive or negative for a concave lense?

positive

For a mirror is the focal length positive or negative for a convex lens?

negative

For a lense, is the focal length positive or negative for a concave lense?

negative

For a lense, is the focal length positive or negative for a convex lens?

positive