In a lightning stroke about 21 MC flows in some 4.7 ms. Calculate the current.
| Data statements | Q = 21 x 106 C t = 4.7 x 10-3 s |
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| Formula | I = Q / t | |
| Transposition | (not needed) | |
| Substitution | I = 21 x 106 C / 4.7 x 10-3 s | |
| Evaluation | I = 4.5 x 109 A | 4.468... has to be reduced to 2 SF. |