Investigating the Resistance of a 12 Volt Bulb When the Current Changes Prediction: I predict that as the current increases the temperature of the lamp will also increase; therefore the resistance will also increase. I know this because I have read it in the AQA syllabus. Plan Safety: I need to ensure the safety of myself and others by making sure that the experiment is conducted accurately and safely. - Apparatus should be placed in a safe place and put away safely. - Electrical
Light Intensity Hypothesis § A light bulb gives out light when electricity passes through it § The more volts you add, the more intense the light is. As you double the voltage, the light intensity doubles. § This is because the rays are more concentrated. The rays are twice as concentrated as the intensity doubles, as more power is running through the circuit § The LDR (Light dependent resistor) measures how intense the light is § The LDR frees up electrons, decreasing resistance
joined together form a battery. A battery pushes electrons round a circuit from the negative terminal to the positive terminal. The voltage of a battery is a measure of the energy delivered by the electrons to the lamp. The unit of voltage is the volt. Voltage is sometimes called potential difference. Current is measured using an ammeter. An ammeter must always be connected in series with the appliance taking the current to be measured. Resistance is what links current and voltage together
Factors Affecting the Resistance of a Wire The aim of this experiment is to investigate one factor that affect the resistance of a wire. I will do this by performing an experiment. First I will need to identify the factors that effect resistance. There are a few factors that affect the resistance, it is determined by the properties an object has. This is know as resistivity. The factors I can investigate are : Ÿ Temperature Ÿ Length Ÿ Cross-sectional area/width Ÿ Material
Constructing a Greenhouse Window Building and testing a sensor to determine number of degrees to which a window is open Introduction When making use of a greenhouse to grow plants out of season or on a large scale for commercial reasons, the temperature within the green house must be carefully regulated, in order to ensure that the plants are under the optimum growing conditions. With the windows shut permanently, the temperature may become too high, and the windows need therefore
Resistance Equipment: Nickel Wire cut into 10 pieces of 30cm length (Ruler, Pliers) Two crocodile clips Five Pieces of Wire Power Source Variable Resistor Ammeter Volt Meter Method: ======= F The Circuit was set up as in the circuit diagram overleaf with a power source of 5 Volts, an ammeter, crocodile clips (holding wires), and a variable resistor in series and a Voltmeter in parallel with the wires. F Nickel chrome wire was then measured to discover the cross
because the bulb would have more energy. Controlled Variable- the controlled variable for this experiment is number of bulbs because the decision is for me to make. Independent Variable- the independent variable for this experiment are the volts, I will be using 1-12v. Independent Variable- The independent variable would be the reading we get of the ammeter. Apparatus- * 5 wires * 1 filament bulb * 1 resister * 1 voltage meter * 5-10 crocodile clips * Ammeter Method-First
The theory of perpetual motion and energy is a topic that is one that is almost an outcast by the scientific community. That is why it so interesting in my opinion. One day I was brain storming and this method just popped into my head. My hypothesis states that a bigger pulley on the router of an electric motor and a smaller pulley on the router of an alternator connected to a battery would put out higher amounts of energy than the same or even smaller pulley on the alternator. The interesting thing
along with potential difference and these are defined as: A Voltage where the charge is losing energy is a potential difference, V. A Voltage where the charge is gaining energy is an electromotive force, E. A relationship exists between volts and joules. A 10v power supply, for example, will give 10J of energy to each coulomb that it pushes round the circuit. When a single coulomb passes through a component with a p.d. of 5v, it transfers 5J of energy to the p.d. In it's simplest form
true when the temperature is constant. If you read the current as you change the potential difference across a conductor the ratio V/I (volts over amps) is the same if it is ohmic. From digitalbrain.com --------------------- An ohmic resistor is a component in which Ohm's law is satisfied. [IMAGE][IMAGE][IMAGE][IMAGE][IMAGE] OHMIC VOLTS [IMAGE] NON OHMIC AMPS Preliminary Experiment: Resistance through a wire =================================================
have been a bad thing, however, as we were conducting the experiment to find out solely the effect of the length of wire on resistance, and not the temperature of the wire. Below are the results of our preliminary experiment: 30cm 60cm volts current current 1 0.65 0.37 2 1.43 0.79 3 2.09 1.12 4 2.65 1.42 5 3.52 1.87 6 4.03 2.2 7 4.97 2.6 8 5.16 2.84 9 6.29 3.23 10 6.64 3.65 11 7.91
second method of measuring three phase power is the useful for both balanced and unbalanced loads. By connecting a wattmeter with its current probes in series with red phase and volt probes between red and yellow phase. The second wattmeter should be connected with its current probes in series with the blue phase and the volt probes between the blue and yellow phases. By adding these two values together there total power for the system can be
backup generator to start. Once the ATS sees that the generator is r... ... middle of paper ... ...ed on. 3.4.2 When WAPDA Supply is again restored (Turning Generator OFF) 1. But wapda supply is continuously being monitored, whenever it turns > 180 volts, its circuit is turned on and generator’s circuit is turned off. 2. In this way generator is turned OFF. 3.5 REAL TIME SIMULATIONS: 2 Simulations are shown below: 3.5.1 WAPDA Circuit is Turned ON. 1- First with wapda supply turned on i-e generator’s
Bicycle sales have been flourishing in America and other European countries in recent years, with some justification being high gas prices and the unequivocal pollution that contributes toward global warming. Booming bike sales attracts more bikers to the road and for long hours, during night in enjoyable weather. Cycling at night can be extremely dangerous. It’s not a good idea to ride a bike at night, especially when it’s too dark. It’s safe to always travel on a well-lit road. But when riding
An Investigation into Factors Affecting Resistance of a Wire Plan: The possible variables I could use to find out factors affecting resistance are material wire is made of, length of wire, temperature and cross sectional area of wire. I will use cross sectional area of wire and length of wire because I think it will be hard to draw conclusions from the material of wire. I am not doing temperature because it would be hard to get results from and I think they wouldn't be as accurate.
Table 3.1, located below, shows the battery voltage at the beginning of the lab. Table 3.1: Battery Pack Functional Test Measured (V) Expected Initial Battery Voltage 9.540 9-10 VDC The initial battery voltage was recorded as 9.540 volts, a number greater than 9.00 volts, indicating that the battery was almost fully charged. Table 3.2, located below, shows the battery pack characterization. The table shows the voltage of the battery and the current through the battery as a function of time. Table
the wire to the crocodile-clip leads and set voltage to 1 5) Other variables such as voltage, diameter of wire and temperature will be kept constant. 6) Take the reading from the ammeter and record in results table. (trying to keep the volt reading the same at all times, adjusts using the variable resistor) 5) Repeat 3 times for each length of wire and find the average. 6) Then work out the resistance using the formula V÷I=R (Voltage ÷ Current = Resistance) Apparatus Power
different thicknesses of wire I am testing are 1 36 SWG (very thin) 2 34 SWG 3 30 SWG 4 28 SWG 5 26 SWG (very thick) I tested all the wires at 3 volts, first I set up the equipment as shown below (Diagram) and then recording the results on the table below Results SWG Type Length of wire in mm Voltage (volts) Current (a) 36 500 3 0.52 34 500 3 0.62 30 500 3 0.81 28 500 3 1.73 26 500 3 2.23 36 400
Investigating How the Length of a Wire Affects Its Resistance Planning: Risk Assessment: * I will handle the power supply carefully. * I am going to only use a maximum voltage of 2 volts. * I will be careful when handling the mains equipment. * I will make sure I have a clear space to work in and nothing on the floor around me. In this investigation, I will set up a simple circuit to be able to read the voltage and current when the length of wire changes, so I then can work
for the electrons to pass through, therefore increasing the resistance. This is a test circuit I used. The ammeter measures the current flowing through the circuit and the voltmeter measures the volts flowing through the circuit. To work out the resistance I used the equation V = IR. V - volts, I - current and R - resistance. I plotted the graph V vs. I. It was a curved graph which showed me that R (resistance) increased as the filament in the bulb got hotter. I also found out the longer