Energy & Voltage Flashcards
(15 cards)
What is the unit of energy?
Joule (J)
What is voltage also known as?
Potential difference
What is the unit of voltage?
Volt (V)
What is the formula for electrical energy transferred?
Energy = Charge × Voltage
What is the unit of electrical charge?
Coulomb (C)
What is the equation for power using voltage and current?
Power = Voltage × Current
What does voltage measure in a circuit?
The energy transferred per coulomb of charge.
What does a higher voltage mean?
More energy transferred per unit of charge.
What is the energy transfer when current flows through a resistor?
Electrical energy → Thermal energy
How is energy transferred in a battery-powered circuit?
Chemical energy → Electrical energy → Heat/light/sound (depending on component)
What is the formula linking energy, power, and time?
Energy = Power × Time
What causes current to flow in a circuit?
A potential difference (voltage) across the components.
What is the definition of current?
The rate of flow of electric charge.
What is the equation linking charge, current, and time?
Charge = Current × Time
What is meant by “electrical work”?
The transfer of energy by moving electric charges through a potential difference.
