An electric iron draws a current of $0.5\, A$ when the voltage is $200\, V$. Calculate the amount of electric charge flowing through it in one hour. (in $C$)
- A$1800$
- B$3600$
- C$720$
- D$900$
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The following table provides the resistivity of three samples:
Sample $A$ $B$ $C$ Resistivity $1.6 \times 10^{-8} \Omega \cdot m$ $5.2 \times 10^{-8} \Omega \cdot m$ $100 \times 10^{-6} \Omega \cdot m$
Which of them is suitable for heating elements of electrical appliances and why?
| Sample | $A$ | $B$ | $C$ |
| Resistivity | $1.6 \times 10^{-8} \Omega \cdot m$ | $5.2 \times 10^{-8} \Omega \cdot m$ | $100 \times 10^{-6} \Omega \cdot m$ |
Which of them is suitable for heating elements of electrical appliances and why?
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