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

[填空题]
The potential differe v ez(,wcrb:kgi a)cno f-)/r+nce (*cgr c7,em+lwk1 o pl)$V$) 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 devicen usietjye-u05;x) 5 n and so the uncertainty is the smallest value whicnt0n xui-y )e5sej5;uh it can record, $0.01 \mathrm{~V}$. This is a $10 \%$ uncertainty on the $0.10 \mathrm{~V}$ measurement. The uncertainty in $V^2$ will be twice this, giving $20 \%$.