4. Will a light bulb glow more brightly when it is connected to a battery as shownbelow, when it is connected to an ammeter on the left or to a voltmeter on the right?

The diagram is in the attachment

Explanation:

An ammeter is use to know the current flowing in a circuit,

A voltmeter is use to know the potential difference across an element.

The ideal voltmeter and the ideal ammeter has zero internal resistance, so as to drop as little voltage as possible as current flows through it.

1. Let analyse the first circuit i.e the ammeter connection

The ammeter is connected rightly and all the current coming from the battery will flow into the bulb and the bulb will glow bright using only the current from the battery and the ammeter work in the circuit is only to measure the current from the battery.

Now let analyse the second circuit, the voltmeter connection.

This is a wrong connection and if this is done it will act has high resistance to the current flow. The connecting of voltmeter in series is equivalent to connecting a very high resistance in series with the circuit. By this only small insignificant amount of current flow through the circuit and nearly results in an open circuit.

Conclusion,

The first connection of ammeter bulb will glow brightly because it uses up all the current from the battery but for the voltmeter connection the current has been reduced due to the high resistance of voltmeter and thus reduces current.

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