All Flashcards
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.
What is the effect of increasing voltage in a circuit (with constant resistance)?
Increased power dissipation ().
What is the effect of increasing current through a resistor?
Increased power dissipation as heat ().
What happens to energy consumption if you double the time a device is used?
Energy consumption doubles ().
What happens to the power if the resistance is doubled and the voltage remains constant?
The power is halved ().
What happens to the power if the current is doubled and the resistance remains constant?
The power quadruples ().
How do you calculate power using current and voltage?
Use the formula: , where P is power, I is current, and V is voltage.
How do you calculate power using current and resistance?
Use the formula: , where P is power, I is current, and R is resistance.
How do you calculate power using voltage and resistance?
Use the formula: , where P is power, V is voltage, and R is resistance.
How do you calculate energy consumption given power and time?
Use the formula: , where E is energy, P is power, and t is time.
What is the first step to solve power related problems?
Identify the known variables (Voltage, Current, Resistance) and choose the appropriate formula.