[填空题]
The potential differo ej.wf ets* 1h (mce19iqh11ven+ych (. *h rq6orqu*gq 1r)aflce ($V$) across a resistor is measured with a digital voltmeter to be $0.10 \; V$ . What is the percentage uncertainty in $V^2$ ? % (only put numerical values in the blank and keep two significant figures.)
参考答案: 20.00
本题详细解析: The voltmeter is a digital device and so the uncertainty is thequcj ) cu(hs4b(a6dl (vpt1 fwxl5a-5 smallest value which it can record, 5 j1vla c5fuw46pcq( )(xdhbtlu(as-$0.01 \mathrm{~V}$. This is a $10 \%$ uncertainty on the $0.10 \mathrm{~V}$ measurement. The uncertainty in $V^2$ will be twice this, giving $20 \%$.
Post time 2024-8-21 21:38:19