Topic 3.1 - Electrical Quantities Flashcards
Define electrical current.
Electrical current is the rate of flow of charge
State the defining equation for current
I = Change In Charge / Change In Time
What is the unit of current
Ampere (A)
Define voltage
Work done per unit charge
Equation for voltage
Work Done / Charge
What is Ohms law
Current and Voltage are directly proportional through a component when temperature is constant
Describe current in a series circuit
Current is the same at all points in the circuit
What law is the distribution of current in a series circuit a consequence of?
The Law Of Conservation Of Charge. Charge cannot be created or destroyed.
Describe current in a parallel circuit
Current is split between branches
Explain how conservation of charge applies to parallel circuits.
Current leaving the sources must equal the sum of currents in branches. (LOCOC)
What law is the distribution of potential differences in a circuit a consequence of?
The Conservation Of Energy
Describe potential differences in a series circuit
Potential difference is split across the circuit in ratios depending on their resistance.
Describe potential difference in parallel circuits
Pd of source = Pd of branches
Equation including power, current, pd?
P=IV
What is the IV Characteristic for an ohmic conductor?
Linear
