All Flashcards
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 electrical power?
The rate at which electrical energy is transferred or converted, measured in Watts (W).
Define Watt (W).
The unit of power, representing the rate of energy transfer or conversion.
What is the relationship between power and energy?
Power is the rate at which energy is used or transferred. Energy equals power multiplied by time ().
Define resistance (R).
A measure of the opposition to current flow in an electrical circuit. Measured in ohms (Ω).
Define current (I).
The rate of flow of electric charge through a conductor. Measured in amperes (A).
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.