All Flashcards
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.
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.
Define electrical power.
The rate at which electrical energy is transferred or converted, measured in Watts (W).
What is the unit of power?
Watt (W).
Define voltage (V).
The electric potential difference, or the electric pressure, expressed in volts.
Define current (I).
The rate of flow of electric charge, measured in amperes.
Define resistance (R).
A measure of the opposition to current flow in an electrical circuit, measured in ohms.