Practice
Basic Electricity & Electronics — Practice
Voltage, current, resistance and power — the arithmetic every other topic depends on. Untimed topic practice with a full explanation after every question, so a wrong answer becomes a study note rather than a dead end.
Questions
16
Time limit
Untimed
Pass mark
60%
Before you start
- Untimed. The explanation appears as soon as you answer, because the point here is to learn rather than to score.
- Mark an answer as a guess and it enters your review queue even if it happened to be right.
- Every answer moves your ability estimate for that topic and updates your readiness score.
- Retake as often as you like.
Sample questions
Which unit is used to measure electrical resistance?
- Ampere
- Ohm
- Volt
- Watt
Why Ohm is right: Resistance is measured in ohms (symbol Ω). The ampere measures current, the volt measures potential difference, and the watt measures power.
How many kilohertz are there in 2.5 megahertz?
- 25 kHz
- 250 kHz
- 2,500 kHz
- 25,000 kHz
Why 2,500 kHz is right: One megahertz is 1,000 kilohertz, so 2.5 MHz × 1,000 = 2,500 kHz. Moving from mega- to kilo- always multiplies by one thousand.
The prefix 'micro' represents which multiplier?
- One thousandth
- One millionth
- One thousand
- One billionth
Why One millionth is right: Micro (µ) means one millionth, or 10⁻⁶. One thousandth is milli (m), one thousand is kilo (k), and one billionth is nano (n).