A parallel circuit with 4 branches, each with one 50 ohm resistor. Calculate the equivalent resistance of the circuit.
What is 12.5 ohm?
100
A device that increases or decreases voltage in a power line.
What is a transformer?
100
A ____ attracts iron objects.
What is a magnet?
100
Electric charge that has accumulated on an object.
What is static electricity?
100
Circuit with more than 1 path.
What is a parallel circuit?
200
An appliance requires 0.3 A of current and is operated on a 120 V service for 2 hours. How much energy (in kWh) is used?
What is 0.72 kWh?
0.3 A * 120 V = 36 W = 0.036 kW
0.036 kW * 2 h = 0.072 kWh
200
A current that does not reverse direction.
What is direct current (DC)?
200
Objects that keep their magnetic properties for a long time.
What is a permanent magnet?
200
Unit for resistance.
What is ohm?
200
In a series circuit, the equivalent resistance is calculated like this.
What is the sum of all resistors?
300
An air conditioner uses 1260 watts of power when plugged into a wall socket that operates at a voltage of 210 volts. Find the current flowing through the air conditioner.
What is 6 A?
300
Current that reverses direction in a regular pattern.
What is alternating current (AC)?
300
A galvanometer measures this.
What is electric current?
300
A device designed to open an overloaded circuit and prevent overheating.
What is a circuit breaker?
300
The total current in a parallel circuit with 3 branches, if
branch 1 = 4.1 A
branch 2 = 3.5 A
branch 3 = 2.4 A
What is 10 A?
400
Ohm's law.
What is V=IR?
400
A reversing switch that rotates with the coil in an electric motor and reverses the direction of the current at every half turn.
What is commutator?
400
Groups of atoms with aligned magnetic poles.
What are magnetic domains?
400
flow of electrons through a conductor.
What is current?
400
Closed path through which electrons flow.
What is a circuit?
500
A transformer has 40 turns on the primary coil and 10 turns on the secondary coil. If the voltage in is 500 V, what is the output voltage?
What is 125 V?
500
The process of producing an electric current by moving a loop of wire through a magnetic field.
What is electromagnetic induction?
500
The strength of magnetic force in an electromagnets is _____ by increasing the current through the coil.
What is increased?
500
Tendency of a material to oppose electron flow.
What is resistance?
500
As current moves through a circuit, the _____ varies.