All Flashcards
What is the difference between power and energy?
Power: The rate at which energy is transferred or used. | Energy: The total amount of work done or energy consumed.
Differentiate between using and to calculate power.
: Use when current and resistance are known. | : Use when voltage and resistance are known.
Compare and contrast voltage and current in a circuit.
Voltage: The electric potential difference that drives the current. | Current: The flow of electric charge through the circuit.
What are the differences between the formulas and ?
: Calculates instantaneous power. | : Calculates total energy consumed over a period of time.
Differentiate between power dissipated by a resistor and power supplied by a voltage source.
Power dissipated by resistor: Energy converted to heat. | Power supplied by voltage source: Energy provided to the circuit.
In a circuit diagram, what does a resistor look like?
A zig-zag line.
In a circuit diagram, what symbol represents a voltage source?
A long line and a short line parallel to each other.
What is the effect of increasing voltage in a circuit with constant resistance?
Increased power dissipation () and increased current.
What is the effect of increasing resistance in a circuit with constant voltage?
Decreased power dissipation () and decreased current.
What happens to the power dissipated if the current through a resistor doubles?
The power dissipated quadruples ().
What happens when a light bulb with a higher wattage is used in a circuit?
It consumes more power and produces more light (or heat).
What is the effect of a short circuit on power dissipation?
A short circuit drastically reduces resistance, leading to a very high current and extremely high power dissipation, potentially causing damage.