All Flashcards
What is the effect of increasing the cross-sectional area of a wire on the current, assuming other factors remain constant?
The current increases.
What is the effect of increasing the drift velocity of charge carriers on the current, assuming other factors remain constant?
The current increases.
What happens if an ammeter is connected in parallel in a circuit?
It can lead to a short circuit.
What happens if a voltmeter is connected in series in a circuit?
It can lead to inaccurate readings.
How do you calculate current (I) if you know the charge ((\Delta Q)) and time ((\Delta t))?
Use the formula:
How do you calculate current (I) using the microscopic current equation?
Use the formula: , where n is the number density of charge carriers, q is the charge of each carrier, A is the cross-sectional area, and (v_d) is the drift velocity.
What is the difference between how ammeters and voltmeters are connected in a circuit?
Ammeters are connected in series. Voltmeters are connected in parallel.
What is the difference in internal resistance between ideal ammeters and voltmeters?
Ideal ammeters have very low internal resistance. Ideal voltmeters have very high internal resistance.