P4 Electricity and Magnesium Flashcards
What is the formula for calculating electrical power?
Power (P) = Voltage (V) × Current (I)
True or False: Voltage is measured in Amperes.
False
Fill in the blank: The unit of electrical resistance is _____.
Ohm
What is the relationship between current, voltage, and resistance according to Ohm’s Law?
V = I × R
Which law states that the total current entering a junction equals the total current leaving?
Kirchhoff’s Current Law
What is the formula for calculating electrical energy consumed?
Energy (E) = Power (P) × Time (t)
True or False: A series circuit has the same current flowing through all components.
True
What is the effect of increasing resistance in a circuit with a constant voltage?
The current decreases.
Fill in the blank: The unit of electric charge is _____.
Coulomb
What is the formula for calculating the total resistance in a series circuit?
R_total = R1 + R2 + R3 + …
What type of circuit allows multiple paths for current to flow?
Parallel circuit
True or False: In a parallel circuit, the voltage across each component is the same.
True
What is the magnetic field around a current-carrying wire called?
Magnetic field lines
Fill in the blank: The device used to measure electric current is called an _____.
Ammeter
What is the formula for calculating the total resistance in a parallel circuit?
1/R_total = 1/R1 + 1/R2 + 1/R3 + …
What is the principle that describes the force between two charged objects?
Coulomb’s Law
True or False: Magnetism is a result of moving electric charges.
True
What is the SI unit of magnetic flux density?
Tesla
Fill in the blank: The phenomenon where a current-carrying conductor experiences a force in a magnetic field is known as _____.
Electromagnetic induction
What is the formula for calculating the force on a current-carrying conductor in a magnetic field?
F = B × I × L
What is the name of the device that converts electrical energy into mechanical energy?
Motor
True or False: An insulator allows electric current to flow easily.
False
What does a voltmeter measure?
Voltage
Fill in the blank: The magnetic field lines around a magnet exit from the ____ pole and enter the ____ pole.
North; South
What is the term for the opposition to the flow of electric current?
Resistance
