Physics

1. 1.

   Resistors 6.0 ohm and 3.0 ohm are connected in parallel across an ideal 12 V source. Calculate equivalent resistance and total current, to 2 significant figures.

   [3 marks]
2. 2.

   An ideal 200 microfarad capacitor is charged to 12.0 V. Calculate its charge and stored energy, to 3 significant figures.

   [3 marks]
3. 3.

   A cell gives terminal voltage 5.40 V at current 0.300 A and 4.80 V at 0.600 A. Find its emf and internal resistance, assuming both constant.

   [3 marks]
4. 4.

   A 100 microfarad capacitor initially at 10.0 V discharges through 20.0 kilohm. Find voltage and current magnitude after 3.00 s. Assume an ideal capacitor and constant resistance; give 3 significant figures.

   [3 marks]
5. 5.

   A 12.0 V ideal supply feeds a divider: 2.00 kilohm above the output node and 4.00 kilohm below it to ground. A 4.00 kilohm load is added from output to ground. Find loaded output voltage and supply power. Compare with the unloaded voltage.

   [3 marks]
6. 6.

   An isolated 300 microfarad capacitor at 12.0 V is connected in parallel, like terminals together, to an uncharged 600 microfarad capacitor. Find final voltage and decrease in stored energy. Ideal capacitors; negligible leakage; allow transient dissipation in wires.

   [3 marks]

Original, unofficial practice questions from SubjectScout — not official past-paper questions.