A resistor carries a current of 0.5 A when a voltage of 12 V is applied across it. According to Ohm's Law, what is the resistance of the resistor?
Electrical Principles And Components
Question · Easy
Same battery. Which lets more through?
Short
What is the purpose of the intermediate-frequency (IF) stage in a superheterodyne receiver?
Transmitters and Receivers
Flashcard
A circuit dissipates 24 W of power while drawing 2 A of current. What is the voltage across the circuit?
Prefix meaning 10^-12.
Basic Mathematics
Guess the Term
Chapter 1: Electrical Principles and Components
1.1 Mathematics, Units and Metric Prefixes
Study guide
Cheat sheet
Two resistors of 100 ohms and 100 ohms are connected in parallel. What is the total resistance?
Read the clue and guess the term in 6 tries.
Game
What should you verify before using mains-operated radio equipment that is sold, hired, or supplied?
Safety
Kirchhoff's Current Law states that at any node in an electrical circuit:
Question · Medium
SI unit of resistance.
Electronic Technical Basics
The capacitive reactance of a capacitor:
What is the correct response to a frayed or damaged station power lead?
The opposition to alternating current in a purely inductive circuit is called:
SI unit of capacitance.
1.2 DC Circuits, Voltage, Current, and Ohm's Law
In a series RLC circuit, resonance occurs when:
Swap tiles to line up three of the same term.
Term Match
Why is excessive headphone volume a station-safety issue?
A sine wave has a period of 2 microseconds. What is its frequency?
Question · Hard
SI unit of inductance.
A PN junction diode conducts current when it is:
What are the uses and limitations of a frequency counter, crystal calibrator, and standard-frequency transmission?
Measurements
In an NPN bipolar junction transistor used as an amplifier, the small input signal is typically applied to which terminal?
Stage that combines two input signals to create new output frequencies.
1.3 Power, Energy, and Resistance Calculations
The RMS value of a sinusoidal AC voltage with a peak value of 100 V is approximately:
Flip two cards at a time to find matching terms.
Term Pairs
What is the practical difference between voltage and current?
Technical Basics
Three 12-ohm resistors are connected in series. What is the total resistance?
Circuit that adjusts amplification according to a parameter such as received signal level.
The unit of capacitance is the farad. A practical capacitor value commonly used for RF coupling might be expressed in:
Why should a resistor's power rating exceed its expected circuit dissipation?
Which statement best describes the energy behaviour of an ideal inductor in an AC circuit?
Sum of unwanted energy from man-made and natural sources inside a receiver's band.
1.4 Resistor Colour Code and Component Symbol Identification
A 10-ohm and a 15-ohm resistor are connected in series across a 25 V supply. What is the current flowing in the circuit?
Find five hidden terms in a grid of letters.
Term Search
What does a resistor colour code identify?
The quality factor (Q) of a resonant circuit is a measure of:
Comparatively long-term change in an operating parameter such as an oscillator's frequency.
When two capacitors of equal value are connected in series, the total capacitance is:
Which three forms of the DC power relationship should you recognise?
A transformer has 200 turns on the primary and 50 turns on the secondary. If 240 V AC is applied to the primary, what is the secondary voltage?
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