Electicity Circuits

Question 1

Kirchhoffs 1st law

Answer 1

Conservation of charge in a closed circuit

Question 2

Kirchoffs 2nd law

Answer 2

Sum of emf=PD

Question 3

Electric current definition, equation and si unit

Answer 3

The rate of flow of charge I=Q/T
SI base unit for current is Amperes(a)

Question 4

Potential difference si unit and definition

Answer 4

V- energy transferred per unit of charge between two points in a circuit.

V= W/Q, (w is energy transferred)

Question 5

Resistance si unit and definition

Answer 5

R- measure of how difficult it for current to pass through a component.

Measured by dividing Pd across a component by the current flowing though it

R = V/I

Question 6

Ohms law

Answer 6

V=IR

Question 7

Potential difference definition

Answer 7

The difference between two points of a circuit, due to charge doing work on componenets

Question 8

Formula for current

Answer 8

I= Q/T (current = charge/ time)

Question 9

Charge formula

Answer 9

I=neV/dt (charge= (free electrons x elementary charge x volume)

Question 10

Mean drift velocity definition

Answer 10

Average velocity of the electrons as they travel down the wire colliding with positive metal ions

Question 11

Potential difference across component formula

Answer 11

Vout= R2/ R1+R2 x Vin
Where Vin is the emf of the circuit and Vout is the potential difference across R2.

Question 12

Potential difference

Answer 12

Change in potential energy per unit charge