Important Questions Test: Electric Current & its Effects - Class 7 MCQ

It makes it easier to draw the circuit diagrams

When an electric current is passed through the wire of the coil to generate a magnetic field, or conversely an external time-varying magnetic field through the interior of the coil generator and energy is also lost in the form of heat.

The key or switch can be placed anywhere in the circuit. When the switch is in the 'ON' position, the circuit from the positive terminal of the battery to the negative terminal is complete.

Tester is used to check whether electricity is flowing through a substance.

• When a large electric current passes through the strand of steel wool, it melts and breaks. This is because some special materials, like the steel wool, cannot handle the high electric current and end up melting and breaking

Dry cells are more durable, they are typically used for remote controls, flashlights and other similar handheld devices.

An ammeter is an instrument used for measuring electric current in units of amperes. An ammeter must be connected in series with the path of the current being measured.

An electric cell has a positive terminal and a negative terminal. The longer line in the symbol represents the positive terminal, and the thicker, shorter line represents the negative terminal. This helps us know which way to connect the cell in a circuit.