Basic Electrical Concepts
An instrument used for measuring electric current.
What is an ammeter?
This is the component that opposes the flow of current in a circuit
What is a Resistor?
This material is commonly used for the core of an electromagnet.
What is soft iron?
P = V × I
What is the formula for electrical power in a resistive circuit?
This is the first safety step after someone receives an electric shock.
What is "Ensure power is isolated before touching a victim of electric shock." ?
The current flowing in a circuit is directly proportional to voltage and inversely proportional to resistance.
What is Ohm's Law?
This is the component that stores electrical energy in an electric field.
What is a Capacitor?
This rule predicts the direction of force on a current-carrying conductor in a magnetic field.
What is Fleming’s left-hand rule?
P = I²R₁ + I²R₂
(for parallel branches)
What is the total power formula for two parallel resistances R₁ and R₂?
The knife blade should be held at this angle when stripping cable insulation.
What is at a right angle?
This is the SI unit of power
What is Watt?
This semiconductor device allows current to flow in one direction only.
What is a Diode?
This process occurs when an electric current passes through a copper sulfate solution.
What is Electrolysis?
P = (V²/R₁ + V²/R₂)
What is the expression for total power in a parallel circuit using supply voltage V?
A zero-ohm reading on an insulation resistance tester indicates this.
What is a short-circuit caused by insulation breakdown?
This is the unit of electrical energy.
What is kilowatt-hour?
This device uses mutual inductance to step voltage up or down.
What is a Transformer?
This condition between the conductor and the magnetic field produces the greatest self-induced EMF voltage.
What is at right-angles? (The maximum induced EMF occurs when a conductor moves at right angles to the magnetic field)
Caribbean utilities typically generate AC power at these frequencies.
What is 30 Hz or 60 Hz?
This is a common insulating material used for house-wiring cables.
What is PVC?
The ratio of real power to apparent power in an AC circuit.
What is power factor?
This protective device melts to interrupt excessive current.
What is a Fuse?
The SI unit of magnetic flux density.
What is Tesla?
kVAr of capacitor = kW tan φ
What calculation corrects a lagging power factor to unity?
This extinguishing agent is safest for electrical fires.
What is Carbon dioxide?