Kognity IB Physics A.0 Measurements & Uncertainty (id: 1e99cdb67)

[填空题]
The potential differeoku p gx,23n-ad on0yxdoiz1 +6,n tk7nce fza 6rv s19dnutoa9 k5z3t6x9 ($V$) across a resistor is measured with a digital voltmeter to be $0.10 \; V$ . What is the percentage uncertainty in $V^2$ ?   % (please only input numerical value without units and without the $\pm$ symbol.)

参考答案: 20.00


本题详细解析:
The voltmeter is a digital device and so the uncertainty is the smallest h *9w)r wir/-e7 hx)uuli9 zmtvalue which it can recor* r9w eztu9h 7w/m)-ur)hixild, $0.01 \mathrm{~V}$. This is a $10 \%$ uncertainty on the $0.10 \mathrm{~V}$ measurement. The uncertainty in $V^2$ will be twice this, giving $20 \%$.