4. A. Ohm’s law states that the current in an electrical circuit varies directly as the voltage and inversely as the resistance.…
Figure 17.7 (a) The current–voltage curve for an ohmic material. The curve is linear, and the slope gives the resistance of the conductor. (b) A nonlinear current–voltage curve for a semiconducting diode. This device doesn’t obey Ohm’s law.…
I have decided to do a preliminary investigation. This preliminary will help plan my main experiment. I will choose 3 lengths, 10cm, 50cm and 100cm. These lengths are reliable as they don't jump lengths too much. One small, medium and large length. Here I will use a simple circuit and study the results, to see they are reliable. This investigation will mainly show the accuracy and how reliable my main investigation is, changing anything that is unreliable and needs corrected. I have learned that it is important to use a multimeter because it shows an accurate digital reading of the resistance and I don't have to work out the resistance manually which can give me a fairer test due to possible mistakes with calculations. It will also cut down the amount of components in the experiment which will make the experiment more reliable as less resistance will be caused from the components rather than the wire. It is also very important to keep the most important variable, current the same throughout the whole investigation. The heat in the wire from the current can cause the wire to affect my results as the ions gain kinetic energy causing them to have a higher collision rate. The multimeter should be a solution to this, as it uses a very small current thus not affecting the temperature in the circuit. The advantage of using the same apparatus consistently is that I will avoid having differences in the results by way of inaccuracies in the measuring equipment, resistance…
INTRODUCTION Electricity is usually invisible. Except for lightning and sparks, you never see it in daily life. However, light bulbs and a magnetic compass can show you when something electrical is happening. By observing their behavior and making a few assumptions, you can begin forming ideas about electricity. This type of thinking is called “building a model”. INVESTIGATION ONE: WHAT IS NEEDED TO LIGHT A BULB? 1.1 Activity: Lighting bulbs in a loop Insert three D-cells into the battery holder (as in Figure 1.1), and insert two ROUND bulbs (not long bulbs) into a pair of sockets. Use three wires to connect the sockets to each other and to the two “terminals” of the battery holder: 1) the spring inside the case near the red spot, and 2) the metal post on the outside of the case near the blue spot. The bulbs should light and be of similar brightness. The battery, bulbs and wires now form a “closed loop”.…
In this Investigation I am going to investigate how the length of a wire affects resistance.…
Purpose: The purpose of this lab is to find the electric current when passing through conductors of different shapes and sizes. Also to gain a general knowledge of the laws governing the flow of current through extended conductors is another objective for this experiment. In this lab we are to experiment with the lines of force and equipotentials. We are also to find out vector field and the relationship between the lines of force and the electric field in this lab.…
To investigate if the length of wire affects its resistance and find out how the resistance changes when the length of wire increases.…
Investigate how the length of a wire affects the current and resistance of a wire.…
For this piece of coursework I have been asked to investigate into the resistance of wires when the length is changed.…
To ensure that the investigation is carried out in fair way, the wire must be measured as accurately as possible and the same circuit and power supply must be used throughout as different power supplies may have different voltages. The experiment will be repeated three times for each length of wire, with low, medium and high resistor. Also, an average should be taken to enable that the test results are reliable.…
Ohm’s law states that the current through a conductor between two points is directly proportional to the potential difference or voltage across the two points, and inversely proportional to the resistance between them.…
Aim: To investigate the factors that affect the resistance in a conductor. The main factors that affect the resistance in a conductor are:…
1. My hypothesis is that the resistance decreases as the temperature increases. I predict my results will have a negative correlation, and that as the temperature…
I predict that the longer the wire the higher the resistance, and the shorter the wire the lower the resistance.…
An often asked question: How can you convert the diameter of a round wire d to the…