Purpose
This interactive provides the ability to explore the basic properties of one-, two-, and three-loop DC circuits.

Using the Interactive
Configure the interactive using the COMPONENTS template on the right-hand side and the COMPONENT VALUES section on the bottom left.

• All components, except the volt meter, are added to the circuit by clicking the corresponding button, then clicking on the grid. Each component fills the space between two grid points.
• The orientation of components is either horizontal or vertical depending on which of the two buttons (just below the components list) is selected when you drag the component to its location.
• You will see a STOP sign until a valid circuit is completed. So, don't stop; continue constructing the circuit. You will see a GO! sign when the circuit is valid.
• If needed, you can remove a single component by dragging it back to its place on the template, or select it (left click on it) and then click DELETE SELECTED located underneath the components template.
• To add a Volt Meter to a circuit, click on the volt meter icon, then click on two points in the circuit across which to connect the meter. The first point will be the negative lead and the second point the positive lead.
• When a Switch is placed in a circuit, it is open. To close it, select it and click the CLOSED checkbox (lower left).

• Alter values of resistance, voltage, capacitance, and inductance by selecting the relevant element, which will turn red, and using the COMPONENT VALUES slider bar on the lower left. Note, light bulbs act just like resistors.
• Read potential differences and currents by adding a volt meter and/or ammeter. Click the VOLT METER or AMMETER tab (below the bottom right corner of the grid) to see a graph and numerical value of the reading on the meter.
• You are only allowed one of each kind of meter in a given circuit. To move the ammeter to a new location, drag it. To move the volt meter, reselect the icon (on the template) and choose two new locations for the leads.

1			Using a battery (you are only allowed one) and two resistors, set up a two-loop circuit with the resistors in parallel. Select the battery and use the component values slider bar to set its value to 2.0 volts. Select one resistor and set its value to 2.0 W. Set the value of the other resistor to 4.0 W. What is the equivalent resistance of this circuit?
			A)	3.0 W
			B)	6.0 W
			C)	4/3 W
			D)	3/4 W
			E)	1/2 W
2			What is the total current in the circuit?
			A)	2/3 A
			B)	2.0 A
			C)	3.0 A
			D)	1.5 A
			E)	1/3 A
3			Where should an ammeter be connected to measure the total current?
			A)	In the branch with the 2.0 W resistor
			B)	In the branch with the battery.
			C)	In the branch with the 4.0 W resistor.
			D)	Anywhere in the circuit will measure the overall current.
4			What is the potential difference across the 2.0 W resistor?
			A)	2/3 V
			B)	2.0 V
			C)	3.0 V
			D)	1.5 V
			E)	1/3 V
5			Repeat the last two steps for the 4.0 W resistor. What is the current through the 2.0 W resistor?
			A)	1.0 A
			B)	2.0 A
			C)	3.0 A
			D)	1.5 A
			E)	1/3 A
6			Which of the following statements is true concerning the currents in the three branches of the circuit?
			A)	They are all equal.
			B)	The total current is the sum of the currents through the batteries.
			C)	Half of the total current flows through each resistor.
			D)	All of the total current flows through the smaller resistor.