Electricity

Question 1

equation that defines current

Answer 1

I=Q/t

Question 2

equation that defines voltage

Answer 2

V=EQ

Question 3

equation that defines resistance

Answer 3

R=V/I

Question 4

equation that defines power

Answer 4

P=E/t

Question 5

Ohms Law

Answer 5

I=kV provided that temp remains constant

Question 6

Kirchoff’s Laws

Answer 6

1) coservation of charge/ current

2) conservation of energy/ voltage

Question 7

Resistance in series vs parallel

Answer 7

series: Rt=R1+R2
parallel: 1/Rt= 1/R1 + 1/R2

Question 8

Cells in series vs parallel

Answer 8

series: Vt= V1 +V2 (used to increase voltage)
parallel: Vt=V1 (used to increase current)

2 cells in series has 4× more resistance than w cells in parallel

Question 9

Resistivity definition and equation

Answer 9

Measure if how good or bad a conductor is

R=(pl)÷A

Question 10

Equation showing relationship between resistance and voltage

Answer 10

Vt ÷ Vout = Rt ÷R¹

Question 11

calculation for e.m.f.

Answer 11

emf=IR+Ir

Question 12

Application of low internal resistance

Answer 12

minimise lost colts in CAR BATTERY

-battery has relatively low emf and power supplied must be high. P=VV/R

Question 13

Superconductivity

Answer 13

substance with 0resistance below its critical temperature (close to 0Kelvin)

Question 14

Uses of Superconductivity

Answer 14

transmission cable- get 100% efficiency, no use for transformers

Question 15

Osscilscope Calculations

Answer 15

amplitude (Vo)- y axis
time period (s)- x axis
f=1/t

Question 16

AC Theory (rms)

Answer 16

average V= V/root2
average I= I/root2
average P=IV/2