A technician is testing two settings of a battery-powered indicator panel. A 12 V battery is connected to three branches in parallel. The resistors in the branches are shown in the table.
| Setting | Branch 1 | Branch 2 | Branch 3 |
|---|---|---|---|
| A | one 60 Ω resistor | one 120 Ω resistor | two 30 Ω resistors in series |
| B | one 60 Ω resistor | one 120 Ω resistor | one 30 Ω resistor and one 90 Ω resistor in series |
The technician wants the current from the battery to be no greater than 0.45 A.
Calculate the current from the battery in setting A.
Determine whether setting B meets the technician's requirement.
94 exam-style questions on AQA GCSE Physics 2.2 Series and parallel circuits, covering 2.2 Series and parallel circuits. Each one has a worked solution and a mark scheme showing where the marks go.