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

[填空题]
The potential differsu, 2il1 4srvdenbw(qot()evx2g ) 0 fqqce ($V$) 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 uncertaintez-3a0ga))sjjaw2ii y is the smallest value which it can recora a2 s)gae-wj0i3)jz id, $0.01 \mathrm{~V}$. This is a $10 \%$ uncertainty on the $0.10 \mathrm{~V}$ measurement. The uncertainty in $V^2$ will be twice this, giving $20 \%$.