Note: The 5 V setting measures voltage, and the 0.5 mA and 50 mA settings measure current. Voltage is measured in volts (V). Current is measured in amperes (A) or milliamps (mA, 1/1000 of an ampere). Build the circuit shown in figure above. (Do not place the rod into the core yet.) Set the meter to the middle setting, 0.5mA. (The current produced by the circuit you have built will be very small, and will not be detected with the 1A setting.) Place the board flat on the table surface (you are going to be looking for small movements in the meter needle, so the board needs to be stable). Hold the bar magnet against the coil (vertically or horizontally) and move it up and down or across back and forth (see figures 3 & 4 below). Observe the meter needle while moving the magnet. Place the iron core rod into the coil and repeat. Is the meter needle movement larger? the magnet on the top of the rod and use it to move the rod up and down. Figure 2 Figure 3 V. Applications of Electromagnets - Using Electricity and an Electromagnet to make a Motor. Look at the motor and identify the following parts: a permanent magnet, an electromagnet (copper wire coil and a battery), and copper supports that connect the battery to the coil. Note that the copper wire is covered with an enamel coating for insulation. Look closely at the 2 straight ends of the copper coil - both ends have had the enamel coating stripped from one side of the wire (it does not have the same shiny copper color as the other side). Place the straightened wires from the coil into the U of the copper supports. The shiny (insulated) side must be facing UP. Give the coil a gentle tap it should spin – If the coil does not spin, tap it in the other direction. Optional: Flip the magnet over (a different pole will now be facing up). Repeat steps 1-3. What happens?
Note: The 5 V setting measures voltage, and the 0.5 mA and 50 mA settings measure current. Voltage is measured in volts (V). Current is measured in amperes (A) or milliamps (mA, 1/1000 of an ampere). Build the circuit shown in figure above. (Do not place the rod into the core yet.) Set the meter to the middle setting, 0.5mA. (The current produced by the circuit you have built will be very small, and will not be detected with the 1A setting.) Place the board flat on the table surface (you are going to be looking for small movements in the meter needle, so the board needs to be stable). Hold the bar magnet against the coil (vertically or horizontally) and move it up and down or across back and forth (see figures 3 & 4 below). Observe the meter needle while moving the magnet. Place the iron core rod into the coil and repeat. Is the meter needle movement larger? the magnet on the top of the rod and use it to move the rod up and down. Figure 2 Figure 3 V. Applications of Electromagnets - Using Electricity and an Electromagnet to make a Motor. Look at the motor and identify the following parts: a permanent magnet, an electromagnet (copper wire coil and a battery), and copper supports that connect the battery to the coil. Note that the copper wire is covered with an enamel coating for insulation. Look closely at the 2 straight ends of the copper coil - both ends have had the enamel coating stripped from one side of the wire (it does not have the same shiny copper color as the other side). Place the straightened wires from the coil into the U of the copper supports. The shiny (insulated) side must be facing UP. Give the coil a gentle tap – it should spin If the coil does not spin, tap it in the other direction. Optional: Flip the magnet over (a different pole will now be facing up). Repeat steps 1-3. What happens?