How many lamps that draw 200 milliamperes can be connected to a circuit supplying 10 amperes?

To determine how many lamps that draw 200 milliamperes can be connected to a circuit supplying 10 amperes, begin by converting the circuit's current capacity from amperes to milliamperes, since the lamps' current draw is given in milliamperes.

1. Convert 10 amperes to milliamperes:

• Since 1 ampere equals 1000 milliamperes, 10 amperes is equal to 10,000 milliamperes (10 A * 1000 = 10,000 mA).

2. Next, calculate how many lamps can be powered by this current:

• Each lamp draws 200 milliamperes, so you divide the total available current (10,000 milliamperes) by the current draw per lamp (200 milliamperes):

• (10,000 \text{ mA} \div 200 \text{ mA/lamp} = 50 \text{ lamps}).

Therefore, the circuit can safely support 50 lamps drawing 200 milliamperes each, which confirms that the correct answer is indeed the choice indicating 50 lamps.