Final answer:
According to Ohm's law, the voltage drop across a resistor can be calculated using V = IR, where I is the current and R is the resistance. To find the voltage drop across the 7 ohm resistor, we need to know the current flowing through it.
Step-by-step explanation:
According to Ohm's law, the voltage drop, V, across a resistor when a current flows through it is calculated using the equation V = IR, where I equals the current in amps (A) and R is the resistance in ohms (Ω). To find the voltage drop across the 7 ohm resistor, we need to know the current flowing through it. If the current is given, we can simply substitute the values into the equation to calculate the voltage drop. If the current is not given, we would need additional information to determine it.