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Measuring Voltage and Current • Aims • Know the units of voltage and current • Know how to measure voltage and current Circuit Symbols A. B. C. D. E. Ammeter Motor Voltmeter Bulb Cell F. G. H. I. Battery Buzzer Switch closed Switch open Draw a Circuit Diagram for the Apparatus Below Draw a Circuit Diagram for the Apparatus Below Draw a Circuit Diagram for the Apparatus Below Measuring Current. The unit of measure for current is the "amp" which has the symbol A. We measure the current using a device called an ammeter. In a circuit this is given the symbol A When measuring the current through a component, the ammeter is always connected in series (in the same loop) with that component. A Measuring Voltage. We measure the voltage using a device called an voltmeter. In a circuit this is given the symbol V When measuring the voltage across a component, the voltmeter is always connected in parallel with (or across) the component. V 1 This is still a SERIES circuit. V2 The voltage supplied by the battery is shared between all the components in a series circuit Series Circuit Animation Experiment: Measuring Voltage V Circuit 1 R V 1. Set up the circuit as shown above. 2. Connect the voltmeter across the power supply and measure the supply voltage. 3. Then connect the voltmeter across the resistance (R) and measure this voltage. Basic ideas… Electric current is when electrons start to flow around a circuit. We use an _________ to measure it and it is measured in ____. Voltage is how big the push on the electrons is. We use a ________ to measure it and it is measured in ______, a unit named after Volta. Resistance is anything that resists an electric current. It is measured in _____.” (Words: volts, amps, ohms, voltage, ammeter, voltmeter) Energy changes To describe an energy change for a light bulb we need to do 3 steps: 1) Write down the starting energy: 3) Write down what energy types are given out: 2) Draw an arrow Electricity Light + heat What are the energy changes for the following…? 1) An electric fire 2) A rock about to drop 3) An arrow about to be fired Electrical Energy Consider a simple circuit: The job of the battery is to convert ______ energy into _________ energy… The job of the bulb is to convert the _________ energy it receives from the battery into ______ energy. Words – electrical (x2), light, chemical Hi. I’m Ernie Electron and I’m going to show you how I get energy around a circuit. Electrical Energy Energy Hi. I’m Ernie Electron and I’m going to show you how I get energy around a circuit. Electrical Energy Energy Hi. I’m Ernie Electron and I’m going to show you how I get energy around a circuit. Electrical Energy Energy