All Flashcards
Define electric power.
The rate of energy transfer or conversion in an electrical circuit, measured in watts.
What is current (I)?
The rate of flow of electric charge past a point or region.
What is voltage (ΔV)?
The electric potential difference between two points in a circuit.
Define Resistance (R).
A measure of the opposition to current flow in an electrical circuit.
What is the formula for electric power in terms of current and voltage?
What is the formula for electric power in terms of current and resistance?
What is the formula for electric power in terms of voltage and resistance?
What is the difference between power and energy?
Power is the rate of energy use (how fast energy is used), while energy is the total amount used.
Compare a 60-W lightbulb and a 100-W lightbulb in terms of resistance when operating at the same voltage.
The 60-W lightbulb has greater resistance than the 100-W lightbulb.
What is the effect of higher power in a circuit element?
Energy is transferred, converted, or dissipated at a faster rate.
What happens to the brightness of a lightbulb if the power doubles?
The lightbulb becomes significantly brighter.
What happens when electrical energy is transferred?
Electrical energy can turn into heat (thermal energy).
What happens when the resistance increases in a circuit, assuming voltage remains constant?
The power dissipated decreases, according to the formula .
What happens when the current increases through a resistor?
The power dissipated by the resistor increases, according to the formula .