Rules Physics

Question 1

In series circuits

Answer 1

electrical components are connected one after another in a single loop

Question 2

Circuit rules Series

Answer 2

An electron will pass through every component on its way round the circuit. If one of the bulbs is broken then current will not be able to flow round the circuit. If one bulb goes out, they all go out.

Question 3

series circuit is one loop defenition

Answer 3

all electrons in that loop form one current.

Question 4

Potential difference in series

Answer 4

The current will transfer energy from the power supply to the components in the circuit. Since energy has to be conserved, all of the source energy is shared between the components.

Question 5

Since potential difference is used to measure changes in energy

Answer 5

the potential difference supplied is equal to the total of the potential differences across all other components of the circuit

Question 6

Resistance in series

Answer 6

If two resistors are connected in series, the current must flow through both of them meaning the total resistance is both values added together

Question 7

I1=I2=I3 is when

Answer 7

current (I) is measured in amps (A)

Question 8

Vs=V1+V2 is when

Answer 8

potential difference (V) is measured in volts (V)

Question 9

R(toatal)=R1+R2 is when

Answer 9

resistance (R) is measured in ohms (Ω)

Question 10

Parallel circuits,In parallel circuits

Answer 10

electrical components are connected alongside one another, forming extra loops.

Question 11

Circuit rules parallel

Answer 11

An electron will not pass through every component on its way round the circuit. If one of the bulbs is broken then current will still be able to flow round the circuit through the other loop. If one bulb goes out, the other will stay on.

Question 12

Current in parallel

Answer 12

Since there are different loops, the current will split as it leaves the cell and pass through one or other of the loops An ammeter placed in different parts of the circuit will show how the current splits

Question 13

I1=I2+I4=I3 is when

Answer 13

current (I) is measured in amps (A)

Question 14

Resistance in parallel

Answer 14

If two resistors are connected in parallel so that the current will flow through either one or the other, but not both, then the overall resistance is reduced as less current is flowing through each.

Question 15

It is possible to use a formula to work out the total resistance of two resistors in parallel.

This is the formula:

Answer 15

1/R(total)=1/R1+1/R2

Question 16

It can be rearranged into a more useful form:

Answer 16

R(total)=R1.R2/R1+R2