Electricity week 3&4

find I₁

determine the voltage of the 10 ohm resistor

Capacitors consist of two conducting surfaces separated by an insulating layer called a __________

how does a simple capacitor work, select 2

• when switch is closed electrons flow from bottom plate into battery and from battery onto top plate

• when switch is closed electrons flow from top plate into battery and from battery onto bottom plate

• charge produces a magnetic field across the capacitor and a voltage across it

• charge produces an electric field across the capacitor and a voltage across it

C =

units for capacitance

• volts (V)

• farads (F)
• watts (W)

A 10 μF capacitor has 10 V across it. What quantity of charge is stored in it?

• 100 μC
• 100 W

• 90 A

• 100 C

A constant current cannot flow through a capacitor but an alternaiting current can

• false because the alternating current will give the impression of crossing

• true because the polarities of the electrons keeps switching allowing them to cross

• false because the gap on the capacitor prevents this from happening

• true because the alternating current will have an alternating voltage that helps it cross

what is C =