1. Testing connections for proper voltage and current

2. Measuring Voltage, current and resistance Generally we use a multi-meter to measure the properties of a circuits. Here is a good video illustrating the basic use of a multimeter And here is a virtual place to practice http://phet.colorado.edu/en/simulation/circu it-construction-kit-dc http://www.youtube.com/watch?v=BW3Wj7 UD-_s

3. Tips for checking voltage and current Checking the voltage of a battery may give you a sense of whether it is charged or not, but to be certain, it is critical that either… A load is applied to the battery while it is being tested. This is because the internal resistance of a battery increases as it loses its charge, which may not be obvious unless it is being discharged You use a car battery tester that has been designed to apply a large enough load to do this without a circuit Remember when measuring current, the meter must be placed “in-line” and the correct amperage port is being used with the meter’s leads, ask for permission to do this first, as it is common to blow the fuse if done incorrectly