In the circuit shown in $($Eigure $1),$ the $6\mathrm{.}0$ resistor is consuming energy at a rate of $21\mathrm{.}0\frac{J}{s}$ when the current through a flows as shown

Part A

Find the current through the ammeter A

Express your answer in amperes.

AE $$

$I=$

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Part B

What are the polarity and emf $E$ of the battery, assuming it has negligible internal resistance?

Express your answer in volts. Enter positive value if the polarity of the battery is as shown in the figure in the problem and negative value if the polarity is opposite to what is shown in the figure.

$E=$

$$

A$2$$

$?$

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