3A2: electrical calculations

What is Kirchhoff’s current law?

The algebraic sum of the currents at any electrical junction must equal 0

Or sum of currents flowing away from any point in an electrical circuit must equal the sum of currents flowing toward the point

What is Kirchhoff’s voltage law?

sum of all potential differences around any closed loop in a circuit is equal to 0

What are the rules that apply to series circuits as far as voltage, current and resistance?

• same current through all resistors

• Total resistance is equal to the sum of the individual resistances

• Total voltage drop is equal to the sum of the individual voltage drops

• Supplied emf is equal to total voltage drop of the system

What rules apply to parallel circuits?

• sum of Individual currents through the resistors is equal to total current in the circuit

• Same voltage drop across all resistances

• Resistance is 1/RT = 1/R1 + 1/R2…

What is work energy?

Energy transferred when a force moves through a distance m

How is the peak to peak value calculated?

Ipp = 2 x Imax

What is the effective or root mean square value?

The average values over a wave cycle