3.7.4 Capacitance Flashcards
What is the unit for Capacitance?
Farad
What is the equation for Capacitance?
C = Q/V
What is a Capacitor?
An electrical component that can store electrical charge
What is a Capacitor made of?
They are made of two electrical conducting plates separated by an electrical insulator
How can you increase the charge of a capacitor?
By increasing the potential difference across it, because C=Q/V
What are the base units for a Farad?
1F = 1CV^-1
How do you calculate the energy stored in a battery or power supply?
E = Q∆V
How do you calculate the energy stored in a capacitor? (3)
E = 1/2 QV
E = 1/2 CV^2
E = 1/2 Q^2/C
How much of the energy of the power supply is lost/wasted?
50%
How is energy stored by the power supply lost/wasted ?
Due to resistance in the circuit, the energy is lost as heat to the surroundings
What is charge directly proportional to? (Capacitance)
Voltage/potential difference
What is the area under the curve of a V/Q graph?
Energy stored by a capacitor
How do you combine the capacitance of two capacitors which are in series to each other?
1/ct = 1/c1 + 1/c2 + 1/c3 + ….
How do you combine the capacitance of two capacitors which are parallel to each other?
CT = C1 + C2 + C3 + …….
