Electricity Flashcards
In what direction does a conventional current flow in a circuit?
From positive to negative
What is the formula for charge (Q), using current (I) and time (t)?
Q = I x t
What is Resistance?
The impedance upon an electric current
What is the equation for resistance?
R = V/I
Define Power
The rate at which energy is transferred
What is the formula for Power (P), in terms of energy transferred (E) and time (t)?
P = E/t
What is the formula for power (P), in terms of current (I) and potential difference (V)?
P = IV
What is the formula for power (P), in terms of current (I) and resistance (R)?
P = I²R
What is the formula for power (P), in terms of potential difference (V) and resistance (R)?
P = V²/R
How do you calculate the total resistance in a series circuit?
By adding the values of all the resistors together
What is the formula for the total resistance (Rt) of a parallel circuit?
1/R¹ + 1/R² + … = 1/Rt
What happens to the resistance in a lamp when the voltage increases?
It increases as well
What is Kirchhoff’s First Law?
The rate of flow of charge per second into a junction must be equal to the rate of flow of charge per second out of the junction
What happens to the current between components in series?
It’s the same
What happens to the current between components in parallel?
It’s shared
