Answer Happy

REMARKS The fact that I and I are both negative indicates that the wrong directions were chosen for these currents. Nonetheless, the magnitudes are correct. Choosing the right directions of the currents at the outset is unimportant because the equations are linear, and wrong choices result only in a minus sign in the answer. QUESTION Is it possible for the current through a battery to be directed from the positive terminal toward the negative terminal? (Select all that apply.) Yes. It happens inside a rechargeable flashlight battery or a car battery during recharge. Yes. It can happen when the voltage applied to a battery is greater than its emf. No. The charge carriers inside a battery is never reversible. PRACTICE IT Use the worked example above to help you solve this problem. Find I₁, I₂, and I in figure a, where & = 1' 2' 15 V. 1₁ 1₂: 4.00 10 V A A A W 6.00 W 2.00 J EXERCISE HINTS: GETTING STARTED | I'M STUCK! Find the three currents in figure b, where R = 2.1 2. (Note that the direction of one current may have been chosen wrongly!) 1₁ A A A