basic concepts
What is the unit of electrical resistance?
Ohm
Which component is often used to store charge temporarily in circuits?
Capacitor
A series circuit has three resistors: 2 ohms, 3 ohms, and 5 ohms. What is the total resistance?
10 ohms (R = R1 + R2 + R3)
Which tech giant started out as a garage project by two college dropouts in 1976?
Apple Inc.
Which law states that the sum of currents entering a junction equals the sum of currents leaving?
Kirchhoff’s Current Law (KCL)
Which component increases or decreases voltage while keeping power constant?
Transformer
If you have a 12V battery and a 4-ohm resistor, what is the current in the circuit?
3A (I = V/R)
Which fruit was famously used in an experiment to power a clock using electrodes?
Lemon
What is the difference between AC and DC current?
AC alternates direction periodically, while DC flows in one direction only.
What component is used to convert AC to DC?
Rectifier (usually using diodes)
If two resistors, one 10 ohms and one 20 ohms, are connected in parallel, what is the equivalent resistance?
6.67 ohms (1/R = 1/10 + 1/20)
What electrical component shares its name with a small, nocturnal animal?
Bat (in reference to a battery)
What is the purpose of a fuse in a circuit?
To protect the circuit by breaking the connection if the current is too high.
Which component opposes changes in current and is often used in filters and oscillators?
Inductor
If you connect a capacitor and an inductor in series, what type of circuit have you created?
An LC circuit (or resonant circuit)
In which movie did the main character use a flux capacitor for time travel?
Back to the Future (1985)
What is the primary function of a transformer?
To change the voltage level of an alternating current (AC).
What type of transistor is commonly used in amplification circuits?
Bipolar Junction Transistor (BJT)
A 100W bulb operates at 220V. What is the current flowing through the bulb?
Approximately 0.45A (I = P/V)
Which electronics brand is named after a Japanese mountain?
Fujitsu (named after Mount Fuji)