A 12 V battery is connected to a 20 Ω resistor and a 30 Ω resistor. The two resistors are connected in parallel with each other.
Write down the potential difference across the 20 Ω resistor.
Calculate the current in the 20 Ω resistor. Use the equation: potential difference=current×resistance\text{potential difference} = \text{current} \times \text{resistance}potential difference=current×resistance
The current in the 30 Ω resistor is 0.40 A. Calculate the current in the battery.
The 30 Ω resistor is disconnected from the circuit. Give the effect on the current in the 20 Ω resistor.