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Physics year 1 > Electricity > Flashcards

Flashcards in Electricity Deck (12)
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1

What is voltage?

energy per unit charge; an electric force which drives an electric current between two points.

2

What is the formula for voltage?

V=I x R (Current x Resistance)

3

How do you work out the the resistance of two or more components after each other across a parallel circuit ?

inverse each component and add them together, then inverse the total of the inversed components., e.g.
two bulbs of 5ohm resistance each:
1/5 + 1/5 = 2/5
2/5^-1= 5/2

therefore total resistance equals 2.5 Ohms

4

What is the number of Joules in an electron volt?

1.6 x10 ^ -19 J

5

What is the formula for power?

P = I ^ 2xR ( Current^2 x resistance)

6

What is the formula for power involving voltage?

P=VxI (voltage x current)

7

What is resistivity?

A quantification of how strongly an object resists or conducts an electrical current

8

What is the formula of resistivity?

p= ( R x A ) / L
((resistance x c.s. Area) / length)

9

What is another formula for voltage involving the work done ?

V = W / Q
(work done / charge)

[EXPLAIN WORK DONE?

10

What is a current?

Rate of flow of electrical charge in a circuit.

[UNSURE, use your own words]

11

What is the formula for Current?

I = Q / t
(charge, measured in number of Coulombs / time)

12

What is resistance measured in?

Ohms, sign is omega