P5.4 Electrical currents and energy transfer Flashcards
What is the definition of electric current?
Electric current is the flow of electric charge, typically measured in amperes.
True or False: Electric current can flow through insulators.
False
Fill in the blank: The unit of electric current is ______.
ampere
What is the formula for calculating electric power?
Power (P) = Voltage (V) x Current (I)
Which of the following is a conductor? A) Rubber B) Copper C) Wood
B) Copper
What does Ohm’s Law state?
Ohm’s Law states that V = I x R, where V is voltage, I is current, and R is resistance.
True or False: The direction of electric current is the same as the flow of electrons.
False
What is the role of a resistor in an electrical circuit?
A resistor limits the flow of electric current.
Fill in the blank: Electrical energy is measured in ______.
joules
What is the relationship between voltage, current, and resistance in a circuit?
Voltage is equal to the product of current and resistance.
Define the term ‘circuit.’
A circuit is a closed loop that allows electric current to flow.
Multiple Choice: Which device converts electrical energy into mechanical energy? A) Transformer B) Motor C) Capacitor
B) Motor
What is the function of a capacitor in an electrical circuit?
A capacitor stores electrical energy temporarily.
True or False: Alternating current (AC) flows in one direction only.
False
What is the primary difference between AC and DC?
AC (alternating current) changes direction periodically, while DC (direct current) flows in one direction.
