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Flip to reveal answersGive the six electrical quantities and their SI units.
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All 4 Flashcards — Analogue signals
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Question
Give the six electrical quantities and their SI units.
Answer
Voltage — volt (V). Current — ampere (A). Resistance — ohm (Ω). Power — watt (W). Frequency — hertz (Hz). Time — second (s).
Question
State Ohm's law and the power equation.
Answer
V = I × R, so I = V ÷ R and R = V ÷ I. Power P = V × I.
Question
List the SI multipliers in order.
Answer
p (pico), n (nano), µ (micro), m (milli), the unit, k (kilo), M (mega), G (giga), T (tera). Each step is a factor of one thousand.
Question
How do you catch an SI prefix error?
Answer
Ask whether the value is plausible for that component. Resistors are usually kΩ, capacitors µF, nF or pF, LED currents mA. A 4.7 MΩ resistor in an LED circuit would light nothing.
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