8.09- 8.10 Series and paralle circuits

Question 1

Lamps connected in series

Answer 1

The lamps share the p.d. (voltage) from the battery so each glows dimly.
If one lampp is removed, the other goes out because the circuit is broken.

Question 2

Lamps connected in parallel

Answer 2

Each gets the full p.d. from the battery because each is connected directly to it. So each glows brightly.
If one lamp is removed, the other keeps working because it is still part of an unbroken circuit.

Question 3

When resistors or other components are in series:

Answer 3

the current in each of the components is the same
the total p.d. (voltage) across all the components is the sum of the p.d.s across each of them.

Question 4

When resistors or other components are in parallel:

Answer 4

the p.d. across each of the components is the same
the total current in the main circuit is the sum of the currents in the branches.

Question 5

Cells connected in series

Answer 5

The total p.d. across them is the sum of their individual p.d.s.

Question 6

Cells connected in parallel.

Answer 6

The p.d. across the parallel cells is only the same as from one cell. But together, the cells can deliver a higher current.

Question 7

Resistance in series formula

Answer 7

R= R1 + R2

Question 8

P.d. in series formula

Answer 8

V= V1 + V2

Question 9

Charge in series formula

Answer 9

Combined charge = charges multiplied / charges added

Question 10

Resistance in parallel formula

Answer 10

combined resistance = resistances multiplied / resistances added

Question 11

P.d. in parallel formula

Answer 11

combined p.d. = p.d.s multiplied / p.d.s added