## Fossil Fuels

Fossil fuels are formed from the remains of organic materials such as zooplankton and algae that lived and died about 100 to 400 million years ago when part of the Earth was covered with huge swampy forests. These remains settled to the bottom of those swamps and are buried under anoxic (lack of dissolved oxygen) conditions. As more and more layers …

## Practice On Reading A Vernier Caliper With Zero Error

The top image depicts the vernier caliper with its jaws tightly closed while the bottom image depicts the vernier caliper with its jaws closed on an object. Find the zero error and the correct reading of the vernier calipers below. If you encounter any difficulties or have forgotten how to read a vernier caliper, you can visit How to read …

## Practice On Finding The Zero Error Of A Vernier Caliper

Assuming that the jaws of the vernier calipers are tightly closed, find the zero error of the vernier calipers below. If you encounter any difficulties or have forgotten how to read a vernier caliper, you can visit How to read a vernier caliper.   Vernier Caliper Practice: Without Zero Error With Zero Error   Back To Measurement Of Physical Quantities

## Practice On Reading A Vernier Caliper

Find the readings of the vernier calipers below. If you encounter any difficulties or have forgotten how to read a vernier caliper, you can visit How to read a vernier caliper. More Vernier Caliper Practice: Finding The Zero Error With Zero Error Back To Measurement Of Physical Quantities

## UY1: RC Circuits

In a RC circuit, the resistor is connected in series with a capacitor. Consider a RC circuit (controlled by a switch) with a power source with emf E, where the resistor has resistance R and capacitance C. Initially, at time t < 0, the switch is open. \begin{aligned} q \, &= 0 \\ i \, &= 0 \end{aligned} At time …

## Using Kirchhoff’s Laws On A Complex Circuit

The picture above shows a “bridge” circuit. Find the current in each resistor and the equivalent resistance of the network of five resistors. Find the potential difference $V_{ab}$     Loop 1: \begin{aligned} 13 &= I_{1} + (I_{1} – I_{3}) \\ 2 I_{1} – I_{3} &= 13 \end{aligned} Loop 2: \begin{aligned} 13 &= I_{2} + 2(I_{2} + I_{3})  \\ 3 …

## Using Kirchhoff’s Laws On A Charging Circuit

In the circuit shown, a 12 V power supply with unknown internal resistance r is connected to a run-down rechargeable battery with unknown emf $\epsilon$ and internal resistance 1 $\Omega$, and to an indicator light bulb of resistance 3 $\Omega$ carrying a current of 2 A. The current through the run down battery is 1 A in the direction …