Phys - Capacitance

Question 1

Capacitance

Answer 1

When capacitance changes, p.d stays constant in a constant circuit, so charge must change to maintain the relationship CV = Q.

Charge flows from the cell to the capacitor or vice versa.

Question 2

Capacitor Charging

Answer 2

When a circuit is made, charge begins to accumulate on one of the plates and pulled from the other, causing an increasing p.d across the plates. (specify +ive and -ive)

As more charge accumulates, current decreases in the circuit as it is stored in the capacitor.

Question 3

Capacitor

Answer 3

Parallel plates with dieletric (air, vacuum) between them. An appropriate dielectric will increase the capacitance by increasing permittivity.

Question 4

P.D, Current & Charge Graphs / Charging and Discharging

Answer 4

CHARGING
P.d - Convex curve
Current in circuit - Concave curve
Charge - Convex curve

Opposite with DISCHARGING except for current

RC constant reached for 63% of the initial value

Question 5

Charge Split

Answer 5

Charge is split the same way as current across components (shared in series, sum in parallel)