Final answer:
To determine the initial energy given in defibrillation, we can use the equation Energy (Joules) = Voltage (Volts) × Charge (Coulombs). Based on the weight of the child and the given information, the nurse would expect to give an initial energy of 92 Joules.
Step-by-step explanation:
In this question, a child weighing 51 lbs requires defibrillation, and we need to determine how many joules would be given initially. To solve this, we can use the fact that 1 Joule is equal to 1 ampere-second.
In this case, we know that the child requires defibrillation, which involves passing current through the patient's body. The energy delivered by a defibrillator is given by the equation:
Energy (Joules) = Voltage (Volts) × Charge (Coulombs)
Since we want to find the initial energy delivered, we can rearrange the formula to solve for Charge:
Charge (Coulombs) = Energy (Joules) ÷ Voltage (Volts)
We are given the weight of the child, but we need to convert it to kilograms. There are about 2.205 lbs in a kilogram, so the child weighs approximately 23.13 kg.
Assuming that the initial voltage applied by the defibrillator is reasonable, we can use the same formula and rearrange it to solve for the initial energy:
Energy (Joules) = Voltage (Volts) × Charge (Coulombs)
Plugging in the charge value we found earlier, and rearranging the formula to solve for Voltage:
Voltage (Volts) = Energy (Joules) ÷ Charge (Coulombs)
In this case, the nurse would expect to give an initial energy of 92 Joules to the child, so the correct answer is B) 92.