quiz 15 Flashcards
What are two common types of power supply?
Cells/batteries and mains
Why are filament lamps and diodes not ohmic conductors?
Their resistance changes as current changes
What do step-down transformers do?
Decrease the potential difference
How do step-up transformers increase the efficiency of energy transfer in The National Grid?
Increasing potential difference decreases current, reducing energy loss due to heat
What do step-up transformers do?
Increase the potential difference
What is a battery?
Two or more cells together
What are the two parts of The National Grid?
Cables and Transformers
State the name AND the power of 10 for this prefix: c
Centi, 10 to the power of -2
State the potential difference rule for components connected in series.
Potential difference of power supply is shared between the components
State the potential difference rule for components connected in parallel.
The potential difference across each component is the same
State the current rule for components connected in parallel.
The total current of the circuit is the sum of the currents through the components
State the name AND the power of 10 for this prefix: µ
Micro, 10 to the power of -6
